Merge branch '5.0RC'5.0

23 files changed, 296 insertions, 644 deletions

diff --git a/vendor/sabre/event/.gitattributes b/vendor/sabre/event/.gitattributes
deleted file mode 100644
index 0fdd4b01c..000000000
--- a/vendor/sabre/event/.gitattributes
+++ /dev/null
@@ -1,2 +0,0 @@
-/examples          export-ignore
-/tests             export-ignore
diff --git a/vendor/sabre/event/.gitignore b/vendor/sabre/event/.gitignore
deleted file mode 100644
index d06a78164..000000000
--- a/vendor/sabre/event/.gitignore
+++ /dev/null
@@ -1,14 +0,0 @@
-#composer
-vendor
-composer.lock
-
-#binaries
-bin/sabre-cs-fixer
-bin/php-cs-fixer
-bin/phpunit
-
-#vim lock files
-.*.swp
-
-#development stuff
-tests/cov
diff --git a/vendor/sabre/event/.php_cs.dist b/vendor/sabre/event/.php_cs.dist
new file mode 100644
index 000000000..c5c78a971
--- /dev/null
+++ b/vendor/sabre/event/.php_cs.dist
@@ -0,0 +1,12 @@
+<?php
+
+$config = PhpCsFixer\Config::create();
+$config->getFinder()
+    ->exclude('vendor')
+    ->in(__DIR__);
+$config->setRules([
+    '@PSR1' => true,
+    '@Symfony' => true
+]);
+
+return $config;
\ No newline at end of file
diff --git a/vendor/sabre/event/.travis.yml b/vendor/sabre/event/.travis.yml
deleted file mode 100644
index 020488b79..000000000
--- a/vendor/sabre/event/.travis.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-language: php
-php:
-  - 7.0
-  - 7.1
-  - 7.2
-
-env:
-  matrix:
-    - LOWEST_DEPS=""
-    - LOWEST_DEPS="--prefer-lowest"
-
-before_script:
-  - composer update --prefer-source $LOWEST_DEPS
-
-script:
-  - ./bin/phpunit
-  - ./bin/sabre-cs-fixer fix . --dry-run --diff
-
-sudo: false
-
-cache: vendor
diff --git a/vendor/sabre/event/CHANGELOG.md b/vendor/sabre/event/CHANGELOG.md
deleted file mode 100644
index 5b1fb2e68..000000000
--- a/vendor/sabre/event/CHANGELOG.md
+++ /dev/null
@@ -1,122 +0,0 @@
-ChangeLog
-=========
-5.0.3 (2018-05-03)
-------------------
-
-* Dropped remaining hhvm leftovers.
-* #55: Fixed typo in WildcardEmitterTrait (@SamMousa)
-* #54: export-ignore examples & tests in distribution (@staabm)
-
-5.0.2 (2017-04-29)
-------------------
-
-* #50: Fixed Promise\all to resolve immediately for empty arrays (@MadHed)
-* #48, #49: Performance optimisations for EmitterTrait and WildcardEmitterTrait (@lunixyacht).
-
-5.0.1 (2016-10-29)
-------------------
-
-* #45: Fixed `Emitter` class to use the correct interface. (@felixfbecker).
-
-
-5.0.0 (2016-10-23)
-------------------
-
-* #42: The `coroutine` function now supports `return` in the passed generator
-  function. This allows you to more generally return a value. This is a BC
-  break as this is a feature that was only made possible with PHP 7, and
-  before the coroutine function would only ever return the last thing that
-  was yielded. If you depended on that feature, replace your last `yield` with
-  a `return`.
-
-
-4.0.0 (2016-09-19)
-------------------
-
-* sabre/event now requires PHP 7. If you need PHP 5.5 support, just keep
-  using 3.0.0.
-* PHP 7 type hints are now used everywhere. We're also using strict_types.
-* Support for a new `WildcardEmitter` which allows you to listen for events
-  using the `*` wildcard.
-* Removed deprecated functions `Promise::error` and `Promise::all`. Instead,
-  use `Promise::otherwise` and `Promise\all()`.
-* `EventEmitter`, `EventEmitterTrait` and `EventEmitterInterface` are now just
-  called `Emitter`, `EmitterTrait`, and `EmitterInterface`.
-* When rejecting Promises, it's now _required_ to use an `Exception` or
-  `Throwable`. This makes the typical case simpler and reduces special cases.
-
-3.0.0 (2015-11-05)
-------------------
-
-* Now requires PHP 5.5!
-* `Promise::all()` is moved to `Promise\all()`.
-* Aside from the `Promise\all()` function, there's now also `Promise\race()`.
-* `Promise\reject()` and `Promise\resolve()` have also been added.
-* Now 100% compatible with the Ecmascript 6 Promise.
-
-
-3.0.0-alpha1 (2015-10-23)
--------------------------
-
-* This package now requires PHP 5.5.
-* #26: Added an event loop implementation. Also knows as the Reactor Pattern.
-* Renamed `Promise::error` to `Promise::otherwise` to be consistent with
-  ReactPHP and Guzzle. The `error` method is kept for BC but will be removed
-  in a future version.
-* #27: Support for Promise-based coroutines via the `Sabre\Event\coroutine`
-  function.
-* BC Break: Promises now use the EventLoop to run "then"-events in a separate
-  execution context. In practise that means you need to run the event loop to
-  wait for any `then`/`otherwise` callbacks to trigger.
-* Promises now have a `wait()` method. Allowing you to make a promise
-  synchronous and simply wait for a result (or exception) to happen.
-
-
-2.0.2 (2015-05-19)
-------------------
-
-* This release has no functional changes. It's just been brought up to date
-  with the latest coding standards.
-
-
-2.0.1 (2014-10-06)
-------------------
-
-* Fixed: `$priority` was ignored in `EventEmitter::once` method.
-* Fixed: Breaking the event chain was not possible in `EventEmitter::once`.
-
-
-2.0.0 (2014-06-21)
-------------------
-
-* Added: When calling emit, it's now possible to specify a callback that will be
-  triggered after each method handled. This is dubbed the 'continueCallback' and
-  can be used to implement strategy patterns.
-* Added: Promise object!
-* Changed: EventEmitter::listeners now returns just the callbacks for an event,
-  and no longer returns the list by reference. The list is now automatically
-  sorted by priority.
-* Update: Speed improvements.
-* Updated: It's now possible to remove all listeners for every event.
-* Changed: Now uses psr-4 autoloading.
-
-
-1.0.1 (2014-06-12)
-------------------
-
-* hhvm compatible!
-* Fixed: Issue #4. Compatiblitiy for PHP < 5.4.14.
-
-
-1.0.0 (2013-07-19)
-------------------
-
-* Added: removeListener, removeAllListeners
-* Added: once, to only listen to an event emitting once.
-* Added README.md.
-
-
-0.0.1-alpha (2013-06-29)
-------------------------
-
-* First version!
diff --git a/vendor/sabre/event/README.md b/vendor/sabre/event/README.md
deleted file mode 100644
index 9e2bdd042..000000000
--- a/vendor/sabre/event/README.md
+++ /dev/null
@@ -1,51 +0,0 @@
-sabre/event
-===========
-
-A lightweight library for event-based development in PHP.
-
-This library provides the following event-based concepts:
-
-1. EventEmitter.
-2. Promises.
-3. An event loop.
-4. Co-routines.
-
-Full documentation can be found on [the website][1].
-
-Installation
-------------
-
-Make sure you have [composer][3] installed, and then run:
-
-    composer require sabre/event "^3.0"
-
-This package requires PHP 5.5. The 2.0 branch is still maintained as well, and
-supports PHP 5.4.
-
-Build status
-------------
-
-| branch | status |
-| ------ | ------ |
-| master | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=master)](https://travis-ci.org/sabre-io/event) |
-| 3.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
-| 2.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
-| 1.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=1.0)](https://travis-ci.org/sabre-io/event) |
-| php53  | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=php53)](https://travis-ci.org/sabre-io/event) |
-
-
-Questions?
-----------
-
-Head over to the [sabre/dav mailinglist][4], or you can also just open a ticket
-on [GitHub][5].
-
-Made at fruux
--------------
-
-This library is being developed by [fruux](https://fruux.com/). Drop us a line for commercial services or enterprise support.
-
-[1]: http://sabre.io/event/
-[3]: http://getcomposer.org/
-[4]: http://groups.google.com/group/sabredav-discuss
-[5]: https://github.com/fruux/sabre-event/issues/
diff --git a/vendor/sabre/event/_config.yml b/vendor/sabre/event/_config.yml
deleted file mode 100644
index c4192631f..000000000
--- a/vendor/sabre/event/_config.yml
+++ /dev/null
@@ -1 +0,0 @@
-theme: jekyll-theme-cayman
\ No newline at end of file
diff --git a/vendor/sabre/event/composer.json b/vendor/sabre/event/composer.json
index d7a13c5ca..144704118 100644
--- a/vendor/sabre/event/composer.json
+++ b/vendor/sabre/event/composer.json
@@ -16,7 +16,7 @@
     "homepage": "http://sabre.io/event/",
     "license": "BSD-3-Clause",
     "require": {
-        "php": ">=7.0"
+        "php": "^7.1"
     },
     "authors": [
         {
@@ -41,8 +41,8 @@
         ]
     },
     "require-dev": {
-        "sabre/cs": "~1.0.0",
-        "phpunit/phpunit" : ">=6"
+        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "phpunit/phpunit" : "^7 || ^8"
     },
     "config" : {
         "bin-dir" : "bin/"
diff --git a/vendor/sabre/event/lib/Emitter.php b/vendor/sabre/event/lib/Emitter.php
index ab5e8c90e..e1f23fc87 100644
--- a/vendor/sabre/event/lib/Emitter.php
+++ b/vendor/sabre/event/lib/Emitter.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -11,8 +13,7 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Emitter implements EmitterInterface {
-
+class Emitter implements EmitterInterface
+{
     use EmitterTrait;
-
 }
diff --git a/vendor/sabre/event/lib/EmitterInterface.php b/vendor/sabre/event/lib/EmitterInterface.php
index a7e4b6132..6ce0f34db 100644
--- a/vendor/sabre/event/lib/EmitterInterface.php
+++ b/vendor/sabre/event/lib/EmitterInterface.php
@@ -1,9 +1,11 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Event Emitter Interface
+ * Event Emitter Interface.
  *
  * Anything that accepts listeners and emits events should implement this
  * interface.
@@ -12,26 +14,22 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface EmitterInterface {
-
+interface EmitterInterface
+{
     /**
      * Subscribe to an event.
-     *
-     * @return void
      */
-    function on(string $eventName, callable $callBack, int $priority = 100);
+    public function on(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Subscribe to an event exactly once.
-     *
-     * @return void
      */
-    function once(string $eventName, callable $callBack, int $priority = 100);
+    public function once(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were succesfully
+     * This method will return true if 0 or more listeners were successfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -49,7 +47,7 @@ interface EmitterInterface {
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool;
+    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool;
 
     /**
      * Returns the list of listeners for an event.
@@ -59,7 +57,7 @@ interface EmitterInterface {
      *
      * @return callable[]
      */
-    function listeners(string $eventName) : array;
+    public function listeners(string $eventName): array;
 
     /**
      * Removes a specific listener from an event.
@@ -67,7 +65,7 @@ interface EmitterInterface {
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    function removeListener(string $eventName, callable $listener) : bool;
+    public function removeListener(string $eventName, callable $listener): bool;
 
     /**
      * Removes all listeners.
@@ -75,9 +73,6 @@ interface EmitterInterface {
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
-     *
-     * @return void
      */
-    function removeAllListeners(string $eventName = null);
-
+    public function removeAllListeners(string $eventName = null);
 }
diff --git a/vendor/sabre/event/lib/EmitterTrait.php b/vendor/sabre/event/lib/EmitterTrait.php
index dafae362f..5502ef9f3 100644
--- a/vendor/sabre/event/lib/EmitterTrait.php
+++ b/vendor/sabre/event/lib/EmitterTrait.php
@@ -1,9 +1,11 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Event Emitter Trait
+ * Event Emitter Trait.
  *
  * This trait contains all the basic functions to implement an
  * EventEmitterInterface.
@@ -15,53 +17,45 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait EmitterTrait {
-
-
+trait EmitterTrait
+{
     /**
      * Subscribe to an event.
-     *
-     * @return void
      */
-    function on(string $eventName, callable $callBack, int $priority = 100) {
-
+    public function on(string $eventName, callable $callBack, int $priority = 100)
+    {
         if (!isset($this->listeners[$eventName])) {
             $this->listeners[$eventName] = [
                 true,  // If there's only one item, it's sorted
                 [$priority],
-                [$callBack]
+                [$callBack],
             ];
         } else {
             $this->listeners[$eventName][0] = false; // marked as unsorted
             $this->listeners[$eventName][1][] = $priority;
             $this->listeners[$eventName][2][] = $callBack;
         }
-
     }
 
     /**
      * Subscribe to an event exactly once.
-     *
-     * @return void
      */
-    function once(string $eventName, callable $callBack, int $priority = 100) {
-
+    public function once(string $eventName, callable $callBack, int $priority = 100)
+    {
         $wrapper = null;
-        $wrapper = function() use ($eventName, $callBack, &$wrapper) {
-
+        $wrapper = function () use ($eventName, $callBack, &$wrapper) {
             $this->removeListener($eventName, $wrapper);
-            return \call_user_func_array($callBack, \func_get_args());
 
+            return \call_user_func_array($callBack, \func_get_args());
         };
 
         $this->on($eventName, $wrapper, $priority);
-
     }
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were succesfully
+     * This method will return true if 0 or more listeners were successfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -79,41 +73,35 @@ trait EmitterTrait {
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
-
+    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool
+    {
         if (\is_null($continueCallBack)) {
-
             foreach ($this->listeners($eventName) as $listener) {
-
                 $result = \call_user_func_array($listener, $arguments);
-                if ($result === false) {
+                if (false === $result) {
                     return false;
                 }
             }
-
         } else {
-
             $listeners = $this->listeners($eventName);
             $counter = \count($listeners);
 
             foreach ($listeners as $listener) {
-
-                $counter--;
+                --$counter;
                 $result = \call_user_func_array($listener, $arguments);
-                if ($result === false) {
+                if (false === $result) {
                     return false;
                 }
 
                 if ($counter > 0) {
-                    if (!$continueCallBack()) break;
+                    if (!$continueCallBack()) {
+                        break;
+                    }
                 }
-
             }
-
         }
 
         return true;
-
     }
 
     /**
@@ -124,15 +112,14 @@ trait EmitterTrait {
      *
      * @return callable[]
      */
-    function listeners(string $eventName) : array {
-
+    public function listeners(string $eventName): array
+    {
         if (!isset($this->listeners[$eventName])) {
             return [];
         }
 
         // The list is not sorted
         if (!$this->listeners[$eventName][0]) {
-
             // Sorting
             \array_multisort($this->listeners[$eventName][1], SORT_NUMERIC, $this->listeners[$eventName][2]);
 
@@ -141,7 +128,6 @@ trait EmitterTrait {
         }
 
         return $this->listeners[$eventName][2];
-
     }
 
     /**
@@ -150,8 +136,8 @@ trait EmitterTrait {
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    function removeListener(string $eventName, callable $listener) : bool {
-
+    public function removeListener(string $eventName, callable $listener): bool
+    {
         if (!isset($this->listeners[$eventName])) {
             return false;
         }
@@ -159,11 +145,12 @@ trait EmitterTrait {
             if ($check === $listener) {
                 unset($this->listeners[$eventName][1][$index]);
                 unset($this->listeners[$eventName][2][$index]);
+
                 return true;
             }
         }
-        return false;
 
+        return false;
     }
 
     /**
@@ -172,24 +159,20 @@ trait EmitterTrait {
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
-     *
-     * @return void
      */
-    function removeAllListeners(string $eventName = null) {
-
+    public function removeAllListeners(string $eventName = null)
+    {
         if (!\is_null($eventName)) {
             unset($this->listeners[$eventName]);
         } else {
             $this->listeners = [];
         }
-
     }
 
     /**
-     * The list of listeners
+     * The list of listeners.
      *
      * @var array
      */
     protected $listeners = [];
-
 }
diff --git a/vendor/sabre/event/lib/EventEmitter.php b/vendor/sabre/event/lib/EventEmitter.php
index cae6ac2a6..18971e3ee 100644
--- a/vendor/sabre/event/lib/EventEmitter.php
+++ b/vendor/sabre/event/lib/EventEmitter.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -12,8 +14,7 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class EventEmitter implements EmitterInterface {
-
+class EventEmitter implements EmitterInterface
+{
     use EmitterTrait;
-
 }
diff --git a/vendor/sabre/event/lib/Loop/Loop.php b/vendor/sabre/event/lib/Loop/Loop.php
index 301fe8920..ec09be921 100644
--- a/vendor/sabre/event/lib/Loop/Loop.php
+++ b/vendor/sabre/event/lib/Loop/Loop.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event\Loop;
 
@@ -15,20 +17,19 @@ namespace Sabre\Event\Loop;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Loop {
-
+class Loop
+{
     /**
      * Executes a function after x seconds.
-     *
-     * @return void
      */
-    function setTimeout(callable $cb, float $timeout) {
-
+    public function setTimeout(callable $cb, float $timeout)
+    {
         $triggerTime = microtime(true) + ($timeout);
 
         if (!$this->timers) {
             // Special case when the timers array was empty.
             $this->timers[] = [$triggerTime, $cb];
+
             return;
         }
 
@@ -46,14 +47,12 @@ class Loop {
                     [[$triggerTime, $cb]]
                 );
                 break;
-            } elseif ($index === 0) {
+            } elseif (0 === $index) {
                 array_unshift($this->timers, [$triggerTime, $cb]);
                 break;
             }
-            $index--;
-
+            --$index;
         }
-
     }
 
     /**
@@ -62,12 +61,12 @@ class Loop {
      * The value this function returns can be used to stop the interval with
      * clearInterval.
      */
-    function setInterval(callable $cb, float $timeout) : array {
-
+    public function setInterval(callable $cb, float $timeout): array
+    {
         $keepGoing = true;
         $f = null;
 
-        $f = function() use ($cb, &$f, $timeout, &$keepGoing) {
+        $f = function () use ($cb, &$f, $timeout, &$keepGoing) {
             if ($keepGoing) {
                 $cb();
                 $this->setTimeout($f, $timeout);
@@ -82,32 +81,24 @@ class Loop {
         // Because I'm worried people will be confused by using a boolean as a
         // sort of identifier, I added an extra string.
         return ['I\'m an implementation detail', &$keepGoing];
-
     }
 
     /**
      * Stops a running interval.
-     *
-     * @return void
      */
-    function clearInterval(array $intervalId) {
-
+    public function clearInterval(array $intervalId)
+    {
         $intervalId[1] = false;
-
     }
 
     /**
      * Runs a function immediately at the next iteration of the loop.
-     *
-     * @return void
      */
-    function nextTick(callable $cb) {
-
+    public function nextTick(callable $cb)
+    {
         $this->nextTick[] = $cb;
-
     }
 
-
     /**
      * Adds a read stream.
      *
@@ -118,13 +109,11 @@ class Loop {
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
-     * @return void
      */
-    function addReadStream($stream, callable $cb) {
-
-        $this->readStreams[(int)$stream] = $stream;
-        $this->readCallbacks[(int)$stream] = $cb;
-
+    public function addReadStream($stream, callable $cb)
+    {
+        $this->readStreams[(int) $stream] = $stream;
+        $this->readCallbacks[(int) $stream] = $cb;
     }
 
     /**
@@ -137,65 +126,53 @@ class Loop {
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
-     * @return void
      */
-    function addWriteStream($stream, callable $cb) {
-
-        $this->writeStreams[(int)$stream] = $stream;
-        $this->writeCallbacks[(int)$stream] = $cb;
-
+    public function addWriteStream($stream, callable $cb)
+    {
+        $this->writeStreams[(int) $stream] = $stream;
+        $this->writeCallbacks[(int) $stream] = $cb;
     }
 
     /**
      * Stop watching a stream for reads.
      *
      * @param resource $stream
-     * @return void
      */
-    function removeReadStream($stream) {
-
+    public function removeReadStream($stream)
+    {
         unset(
-            $this->readStreams[(int)$stream],
-            $this->readCallbacks[(int)$stream]
+            $this->readStreams[(int) $stream],
+            $this->readCallbacks[(int) $stream]
         );
-
     }
 
     /**
      * Stop watching a stream for writes.
      *
      * @param resource $stream
-     * @return void
      */
-    function removeWriteStream($stream) {
-
+    public function removeWriteStream($stream)
+    {
         unset(
-            $this->writeStreams[(int)$stream],
-            $this->writeCallbacks[(int)$stream]
+            $this->writeStreams[(int) $stream],
+            $this->writeCallbacks[(int) $stream]
         );
-
     }
 
-
     /**
      * Runs the loop.
      *
-     * This function will run continiously, until there's no more events to
+     * This function will run continuously, until there's no more events to
      * handle.
-     *
-     * @return void
      */
-    function run() {
-
+    public function run()
+    {
         $this->running = true;
 
         do {
-
             $hasEvents = $this->tick(true);
-
         } while ($this->running && $hasEvents);
         $this->running = false;
-
     }
 
     /**
@@ -210,8 +187,8 @@ class Loop {
      * This function will return true if there are _any_ events left in the
      * loop after the tick.
      */
-    function tick(bool $block = false) : bool {
-
+    public function tick(bool $block = false): bool
+    {
         $this->runNextTicks();
         $nextTimeout = $this->runTimers();
 
@@ -232,19 +209,15 @@ class Loop {
 
         $this->runStreams($streamWait);
 
-        return ($this->readStreams || $this->writeStreams || $this->nextTick || $this->timers);
-
+        return $this->readStreams || $this->writeStreams || $this->nextTick || $this->timers;
     }
 
     /**
-     * Stops a running eventloop
-     *
-     * @return void
+     * Stops a running eventloop.
      */
-    function stop() {
-
+    public function stop()
+    {
         $this->running = false;
-
     }
 
     /**
@@ -252,15 +225,14 @@ class Loop {
      *
      * return void
      */
-    protected function runNextTicks() {
-
+    protected function runNextTicks()
+    {
         $nextTick = $this->nextTick;
         $this->nextTick = [];
 
         foreach ($nextTick as $cb) {
             $cb();
         }
-
     }
 
     /**
@@ -273,8 +245,8 @@ class Loop {
      *
      * @return float|null
      */
-    protected function runTimers() {
-
+    protected function runTimers()
+    {
         $now = microtime(true);
         while (($timer = array_pop($this->timers)) && $timer[0] < $now) {
             $timer[1]();
@@ -282,9 +254,9 @@ class Loop {
         // Add the last timer back to the array.
         if ($timer) {
             $this->timers[] = $timer;
+
             return max(0, $timer[0] - microtime(true));
         }
-
     }
 
     /**
@@ -295,36 +267,31 @@ class Loop {
      *
      * @param float|null timeout
      */
-    protected function runStreams($timeout) {
-
+    protected function runStreams($timeout)
+    {
         if ($this->readStreams || $this->writeStreams) {
-
             $read = $this->readStreams;
             $write = $this->writeStreams;
             $except = null;
-            if (stream_select($read, $write, $except, ($timeout === null) ? null : 0, $timeout ? (int)($timeout * 1000000) : 0)) {
-
+            if (stream_select($read, $write, $except, (null === $timeout) ? null : 0, $timeout ? (int) ($timeout * 1000000) : 0)) {
                 // See PHP Bug https://bugs.php.net/bug.php?id=62452
                 // Fixed in PHP7
                 foreach ($read as $readStream) {
-                    $readCb = $this->readCallbacks[(int)$readStream];
+                    $readCb = $this->readCallbacks[(int) $readStream];
                     $readCb();
                 }
                 foreach ($write as $writeStream) {
-                    $writeCb = $this->writeCallbacks[(int)$writeStream];
+                    $writeCb = $this->writeCallbacks[(int) $writeStream];
                     $writeCb();
                 }
-
             }
-
         } elseif ($this->running && ($this->nextTick || $this->timers)) {
-            usleep($timeout !== null ? intval($timeout * 1000000) : 200000);
+            usleep(null !== $timeout ? intval($timeout * 1000000) : 200000);
         }
-
     }
 
     /**
-     * Is the main loop active
+     * Is the main loop active.
      *
      * @var bool
      */
@@ -361,16 +328,14 @@ class Loop {
     /**
      * List of read callbacks, indexed by stream id.
      *
-     * @var callback[]
+     * @var callable[]
      */
     protected $readCallbacks = [];
 
     /**
      * List of write callbacks, indexed by stream id.
      *
-     * @var callback[]
+     * @var callable[]
      */
     protected $writeCallbacks = [];
-
-
 }
diff --git a/vendor/sabre/event/lib/Loop/functions.php b/vendor/sabre/event/lib/Loop/functions.php
index b5884b2b6..bf4d933f2 100644
--- a/vendor/sabre/event/lib/Loop/functions.php
+++ b/vendor/sabre/event/lib/Loop/functions.php
@@ -1,16 +1,15 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event\Loop;
 
 /**
  * Executes a function after x seconds.
- *
- * @return void
  */
-function setTimeout(callable $cb, float $timeout) {
-
+function setTimeout(callable $cb, float $timeout)
+{
     instance()->setTimeout($cb, $timeout);
-
 }
 
 /**
@@ -19,35 +18,27 @@ function setTimeout(callable $cb, float $timeout) {
  * The value this function returns can be used to stop the interval with
  * clearInterval.
  */
-function setInterval(callable $cb, float $timeout) : array {
-
+function setInterval(callable $cb, float $timeout): array
+{
     return instance()->setInterval($cb, $timeout);
-
 }
 
 /**
  * Stops a running interval.
- *
- * @return void
  */
-function clearInterval(array $intervalId) {
-
+function clearInterval(array $intervalId)
+{
     instance()->clearInterval($intervalId);
-
 }
 
 /**
  * Runs a function immediately at the next iteration of the loop.
- *
- * @return void
  */
-function nextTick(callable $cb) {
-
+function nextTick(callable $cb)
+{
     instance()->nextTick($cb);
-
 }
 
-
 /**
  * Adds a read stream.
  *
@@ -58,12 +49,10 @@ function nextTick(callable $cb) {
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
- * @return void
  */
-function addReadStream($stream, callable $cb) {
-
+function addReadStream($stream, callable $cb)
+{
     instance()->addReadStream($stream, $cb);
-
 }
 
 /**
@@ -76,51 +65,41 @@ function addReadStream($stream, callable $cb) {
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
- * @return void
  */
-function addWriteStream($stream, callable $cb) {
-
+function addWriteStream($stream, callable $cb)
+{
     instance()->addWriteStream($stream, $cb);
-
 }
 
 /**
  * Stop watching a stream for reads.
  *
  * @param resource $stream
- * @return void
  */
-function removeReadStream($stream) {
-
+function removeReadStream($stream)
+{
     instance()->removeReadStream($stream);
-
 }
 
 /**
  * Stop watching a stream for writes.
  *
  * @param resource $stream
- * @return void
  */
-function removeWriteStream($stream) {
-
+function removeWriteStream($stream)
+{
     instance()->removeWriteStream($stream);
-
 }
 
-
 /**
  * Runs the loop.
  *
- * This function will run continiously, until there's no more events to
+ * This function will run continuously, until there's no more events to
  * handle.
- *
- * @return void
  */
-function run() {
-
+function run()
+{
     instance()->run();
-
 }
 
 /**
@@ -135,34 +114,30 @@ function run() {
  * This function will return true if there are _any_ events left in the
  * loop after the tick.
  */
-function tick(bool $block = false) : bool {
-
+function tick(bool $block = false): bool
+{
     return instance()->tick($block);
-
 }
 
 /**
- * Stops a running eventloop
- *
- * @return void
+ * Stops a running eventloop.
  */
-function stop() {
-
+function stop()
+{
     instance()->stop();
-
 }
 
 /**
  * Retrieves or sets the global Loop object.
  */
-function instance(Loop $newLoop = null) : Loop {
-
+function instance(Loop $newLoop = null): Loop
+{
     static $loop;
     if ($newLoop) {
         $loop = $newLoop;
     } elseif (!$loop) {
         $loop = new Loop();
     }
-    return $loop;
 
+    return $loop;
 }
diff --git a/vendor/sabre/event/lib/Promise.php b/vendor/sabre/event/lib/Promise.php
index 1d04bd4d4..1d4ddd74a 100644
--- a/vendor/sabre/event/lib/Promise.php
+++ b/vendor/sabre/event/lib/Promise.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -21,8 +23,8 @@ use Throwable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Promise {
-
+class Promise
+{
     /**
      * The asynchronous operation is pending.
      */
@@ -54,15 +56,14 @@ class Promise {
      * Each are callbacks that map to $this->fulfill and $this->reject.
      * Using the executor is optional.
      */
-    function __construct(callable $executor = null) {
-
+    public function __construct(callable $executor = null)
+    {
         if ($executor) {
             $executor(
                 [$this, 'fulfill'],
                 [$this, 'reject']
             );
         }
-
     }
 
     /**
@@ -84,32 +85,32 @@ class Promise {
      * If either of the callbacks throw an exception, the returned promise will
      * be rejected and the exception will be passed back.
      */
-    function then(callable $onFulfilled = null, callable $onRejected = null) : Promise {
-
+    public function then(callable $onFulfilled = null, callable $onRejected = null): Promise
+    {
         // This new subPromise will be returned from this function, and will
         // be fulfilled with the result of the onFulfilled or onRejected event
         // handlers.
         $subPromise = new self();
 
         switch ($this->state) {
-            case self::PENDING :
+            case self::PENDING:
                 // The operation is pending, so we keep a reference to the
                 // event handlers so we can call them later.
                 $this->subscribers[] = [$subPromise, $onFulfilled, $onRejected];
                 break;
-            case self::FULFILLED :
+            case self::FULFILLED:
                 // The async operation is already fulfilled, so we trigger the
                 // onFulfilled callback asap.
                 $this->invokeCallback($subPromise, $onFulfilled);
                 break;
-            case self::REJECTED :
-                // The async operation failed, so we call teh onRejected
+            case self::REJECTED:
+                // The async operation failed, so we call the onRejected
                 // callback asap.
                 $this->invokeCallback($subPromise, $onRejected);
                 break;
         }
-        return $subPromise;
 
+        return $subPromise;
     }
 
     /**
@@ -118,20 +119,19 @@ class Promise {
      * Its usage is identical to then(). However, the otherwise() function is
      * preferred.
      */
-    function otherwise(callable $onRejected) : Promise {
-
+    public function otherwise(callable $onRejected): Promise
+    {
         return $this->then(null, $onRejected);
-
     }
 
     /**
      * Marks this promise as fulfilled and sets its return value.
      *
      * @param mixed $value
-     * @return void
      */
-    function fulfill($value = null) {
-        if ($this->state !== self::PENDING) {
+    public function fulfill($value = null)
+    {
+        if (self::PENDING !== $this->state) {
             throw new PromiseAlreadyResolvedException('This promise is already resolved, and you\'re not allowed to resolve a promise more than once');
         }
         $this->state = self::FULFILLED;
@@ -143,11 +143,10 @@ class Promise {
 
     /**
      * Marks this promise as rejected, and set it's rejection reason.
-     *
-     * @return void
      */
-    function reject(Throwable $reason) {
-        if ($this->state !== self::PENDING) {
+    public function reject(Throwable $reason)
+    {
+        if (self::PENDING !== $this->state) {
             throw new PromiseAlreadyResolvedException('This promise is already resolved, and you\'re not allowed to resolve a promise more than once');
         }
         $this->state = self::REJECTED;
@@ -155,13 +154,12 @@ class Promise {
         foreach ($this->subscribers as $subscriber) {
             $this->invokeCallback($subscriber[0], $subscriber[2]);
         }
-
     }
 
     /**
      * Stops execution until this promise is resolved.
      *
-     * This method stops exection completely. If the promise is successful with
+     * This method stops execution completely. If the promise is successful with
      * a value, this method will return this value. If the promise was
      * rejected, this method will throw an exception.
      *
@@ -171,11 +169,10 @@ class Promise {
      *
      * @return mixed
      */
-    function wait() {
-
+    public function wait()
+    {
         $hasEvents = true;
-        while ($this->state === self::PENDING) {
-
+        while (self::PENDING === $this->state) {
             if (!$hasEvents) {
                 throw new \LogicException('There were no more events in the loop. This promise will never be fulfilled.');
             }
@@ -183,10 +180,9 @@ class Promise {
             // As long as the promise is not fulfilled, we tell the event loop
             // to handle events, and to block.
             $hasEvents = Loop\tick(true);
-
         }
 
-        if ($this->state === self::FULFILLED) {
+        if (self::FULFILLED === $this->state) {
             // If the state of this promise is fulfilled, we can return the value.
             return $this->value;
         } else {
@@ -194,11 +190,8 @@ class Promise {
             // errored. Therefore we need to throw an exception.
             throw $this->value;
         }
-
-
     }
 
-
     /**
      * A list of subscribers. Subscribers are the callbacks that want us to let
      * them know if the callback was fulfilled or rejected.
@@ -224,21 +217,18 @@ class Promise {
      * correctly, and any chained promises are also correctly fulfilled or
      * rejected.
      *
-     * @param Promise $subPromise
      * @param callable $callBack
-     * @return void
      */
-    private function invokeCallback(Promise $subPromise, callable $callBack = null) {
-
+    private function invokeCallback(Promise $subPromise, callable $callBack = null)
+    {
         // We use 'nextTick' to ensure that the event handlers are always
         // triggered outside of the calling stack in which they were originally
         // passed to 'then'.
         //
         // This makes the order of execution more predictable.
-        Loop\nextTick(function() use ($callBack, $subPromise) {
+        Loop\nextTick(function () use ($callBack, $subPromise) {
             if (is_callable($callBack)) {
                 try {
-
                     $result = $callBack($this->value);
                     if ($result instanceof self) {
                         // If the callback (onRejected or onFulfilled)
@@ -257,7 +247,7 @@ class Promise {
                     $subPromise->reject($e);
                 }
             } else {
-                if ($this->state === self::FULFILLED) {
+                if (self::FULFILLED === $this->state) {
                     $subPromise->fulfill($this->value);
                 } else {
                     $subPromise->reject($this->value);
@@ -265,5 +255,4 @@ class Promise {
             }
         });
     }
-
 }
diff --git a/vendor/sabre/event/lib/Promise/functions.php b/vendor/sabre/event/lib/Promise/functions.php
index 275492cbc..986fe2b00 100644
--- a/vendor/sabre/event/lib/Promise/functions.php
+++ b/vendor/sabre/event/lib/Promise/functions.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event\Promise;
 
@@ -14,7 +16,6 @@ use Throwable;
  * @license http://sabre.io/license/ Modified BSD License
  */
 
-
 /**
  * This function takes an array of Promises, and returns a Promise that
  * resolves when all of the given arguments have resolved.
@@ -24,17 +25,17 @@ use Throwable;
  *
  * This array will be in the exact same order as the array of input promises.
  *
- * If any of the given Promises fails, the returned promise will immidiately
+ * If any of the given Promises fails, the returned promise will immediately
  * fail with the first Promise that fails, and its reason.
  *
  * @param Promise[] $promises
  */
-function all(array $promises) : Promise {
-
-    return new Promise(function($success, $fail) use ($promises) {
-
+function all(array $promises): Promise
+{
+    return new Promise(function ($success, $fail) use ($promises) {
         if (empty($promises)) {
             $success([]);
+
             return;
         }
 
@@ -42,25 +43,23 @@ function all(array $promises) : Promise {
         $completeResult = [];
 
         foreach ($promises as $promiseIndex => $subPromise) {
-
             $subPromise->then(
-                function($result) use ($promiseIndex, &$completeResult, &$successCount, $success, $promises) {
+                function ($result) use ($promiseIndex, &$completeResult, &$successCount, $success, $promises) {
                     $completeResult[$promiseIndex] = $result;
-                    $successCount++;
+                    ++$successCount;
                     if ($successCount === count($promises)) {
                         $success($completeResult);
                     }
+
                     return $result;
                 }
             )->otherwise(
-                function($reason) use ($fail) {
+                function ($reason) use ($fail) {
                     $fail($reason);
                 }
             );
-
         }
     });
-
 }
 
 /**
@@ -72,22 +71,20 @@ function all(array $promises) : Promise {
  *
  * @param Promise[] $promises
  */
-function race(array $promises) : Promise {
-
-    return new Promise(function($success, $fail) use ($promises) {
-
+function race(array $promises): Promise
+{
+    return new Promise(function ($success, $fail) use ($promises) {
         $alreadyDone = false;
         foreach ($promises as $promise) {
-
             $promise->then(
-                function($result) use ($success, &$alreadyDone) {
+                function ($result) use ($success, &$alreadyDone) {
                     if ($alreadyDone) {
                         return;
                     }
                     $alreadyDone = true;
                     $success($result);
                 },
-                function($reason) use ($fail, &$alreadyDone) {
+                function ($reason) use ($fail, &$alreadyDone) {
                     if ($alreadyDone) {
                         return;
                     }
@@ -95,14 +92,10 @@ function race(array $promises) : Promise {
                     $fail($reason);
                 }
             );
-
         }
-
     });
-
 }
 
-
 /**
  * Returns a Promise that resolves with the given value.
  *
@@ -111,25 +104,25 @@ function race(array $promises) : Promise {
  *
  * @param mixed $value
  */
-function resolve($value) : Promise {
-
+function resolve($value): Promise
+{
     if ($value instanceof Promise) {
         return $value->then();
     } else {
         $promise = new Promise();
         $promise->fulfill($value);
+
         return $promise;
     }
-
 }
 
 /**
  * Returns a Promise that will reject with the given reason.
  */
-function reject(Throwable $reason) : Promise {
-
+function reject(Throwable $reason): Promise
+{
     $promise = new Promise();
     $promise->reject($reason);
-    return $promise;
 
+    return $promise;
 }
diff --git a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
index 534a3d494..abb6c108e 100644
--- a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
+++ b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -10,6 +12,6 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PromiseAlreadyResolvedException extends \LogicException {
-
+class PromiseAlreadyResolvedException extends \LogicException
+{
 }
diff --git a/vendor/sabre/event/lib/Version.php b/vendor/sabre/event/lib/Version.php
index 9aee4b3ab..e98e2e3ff 100644
--- a/vendor/sabre/event/lib/Version.php
+++ b/vendor/sabre/event/lib/Version.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -9,11 +11,10 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Version {
-
+class Version
+{
     /**
-     * Full version number
+     * Full version number.
      */
-    const VERSION = '5.0.3';
-
+    const VERSION = '5.1.0';
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitter.php b/vendor/sabre/event/lib/WildcardEmitter.php
index 2ef15fe83..1b7c248b2 100644
--- a/vendor/sabre/event/lib/WildcardEmitter.php
+++ b/vendor/sabre/event/lib/WildcardEmitter.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -14,7 +16,7 @@ namespace Sabre\Event;
  *   on('change:*')
  *
  * A few notes:
- * 
+ *
  * - Wildcards only work at the end of an event name.
  * - Currently you can only use 1 wildcard.
  * - Using ":" as a separator is optional, but it's highly recommended to use
@@ -28,10 +30,7 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class WildcardEmitter implements EmitterInterface {
-
+class WildcardEmitter implements EmitterInterface
+{
     use WildcardEmitterTrait;
-
-
-
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitterTrait.php b/vendor/sabre/event/lib/WildcardEmitterTrait.php
index 7d8d62c26..206a8f3c5 100644
--- a/vendor/sabre/event/lib/WildcardEmitterTrait.php
+++ b/vendor/sabre/event/lib/WildcardEmitterTrait.php
@@ -1,9 +1,11 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Wildcard Emitter Trait
+ * Wildcard Emitter Trait.
  *
  * This trait provides the implementation for WildCardEmitter
  * Refer to that class for the full documentation about this
@@ -17,21 +19,19 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait WildcardEmitterTrait {
-
+trait WildcardEmitterTrait
+{
     /**
      * Subscribe to an event.
-     *
-     * @return void
      */
-    function on(string $eventName, callable $callBack, int $priority = 100) {
-
-        // If it ends with a wildcard, we use the wildcardListeners array 
-        if ($eventName[\strlen($eventName) - 1] === '*') {
+    public function on(string $eventName, callable $callBack, int $priority = 100)
+    {
+        // If it ends with a wildcard, we use the wildcardListeners array
+        if ('*' === $eventName[\strlen($eventName) - 1]) {
             $eventName = \substr($eventName, 0, -1);
-            $listeners = & $this->wildcardListeners;
+            $listeners = &$this->wildcardListeners;
         } else {
-            $listeners = & $this->listeners;
+            $listeners = &$this->listeners;
         }
 
         // Always fully reset the listener index. This is fairly sane for most
@@ -44,32 +44,27 @@ trait WildcardEmitterTrait {
             $listeners[$eventName] = [];
         }
         $listeners[$eventName][] = [$priority, $callBack];
-
     }
 
     /**
      * Subscribe to an event exactly once.
-     *
-     * @return void
      */
-    function once(string $eventName, callable $callBack, int $priority = 100) {
-
+    public function once(string $eventName, callable $callBack, int $priority = 100)
+    {
         $wrapper = null;
-        $wrapper = function() use ($eventName, $callBack, &$wrapper) {
-
+        $wrapper = function () use ($eventName, $callBack, &$wrapper) {
             $this->removeListener($eventName, $wrapper);
-            return \call_user_func_array($callBack, \func_get_args());
 
+            return \call_user_func_array($callBack, \func_get_args());
         };
 
         $this->on($eventName, $wrapper, $priority);
-
     }
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were succesfully
+     * This method will return true if 0 or more listeners were successfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -87,42 +82,35 @@ trait WildcardEmitterTrait {
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
-
+    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool
+    {
         if (\is_null($continueCallBack)) {
-
             foreach ($this->listeners($eventName) as $listener) {
-
                 $result = \call_user_func_array($listener, $arguments);
-                if ($result === false) {
+                if (false === $result) {
                     return false;
                 }
             }
-
         } else {
-
             $listeners = $this->listeners($eventName);
             $counter = \count($listeners);
 
             foreach ($listeners as $listener) {
-
-                $counter--;
+                --$counter;
                 $result = \call_user_func_array($listener, $arguments);
-                if ($result === false) {
+                if (false === $result) {
                     return false;
                 }
 
                 if ($counter > 0) {
-                    if (!$continueCallBack()) break;
+                    if (!$continueCallBack()) {
+                        break;
+                    }
                 }
-
             }
-
         }
 
         return true;
-
-
     }
 
     /**
@@ -133,34 +121,27 @@ trait WildcardEmitterTrait {
      *
      * @return callable[]
      */
-    function listeners(string $eventName) : array {
-
+    public function listeners(string $eventName): array
+    {
         if (!\array_key_exists($eventName, $this->listenerIndex)) {
-
             // Create a new index.
             $listeners = [];
             $listenersPriority = [];
-            if (isset($this->listeners[$eventName])) foreach ($this->listeners[$eventName] as $listener) {
-
-                $listenersPriority[] = $listener[0];
-                $listeners[] = $listener[1];
-
+            if (isset($this->listeners[$eventName])) {
+                foreach ($this->listeners[$eventName] as $listener) {
+                    $listenersPriority[] = $listener[0];
+                    $listeners[] = $listener[1];
+                }
             }
 
             foreach ($this->wildcardListeners as $wcEvent => $wcListeners) {
-
                 // Wildcard match
                 if (\substr($eventName, 0, \strlen($wcEvent)) === $wcEvent) {
-
                     foreach ($wcListeners as $listener) {
-
                         $listenersPriority[] = $listener[0];
                         $listeners[] = $listener[1];
-
                     }
-
                 }
-
             }
 
             // Sorting by priority
@@ -168,11 +149,9 @@ trait WildcardEmitterTrait {
 
             // Creating index
             $this->listenerIndex[$eventName] = $listeners;
-
         }
 
         return $this->listenerIndex[$eventName];
-
     }
 
     /**
@@ -181,14 +160,14 @@ trait WildcardEmitterTrait {
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    function removeListener(string $eventName, callable $listener) : bool {
-
-        // If it ends with a wildcard, we use the wildcardListeners array 
-        if ($eventName[\strlen($eventName) - 1] === '*') {
+    public function removeListener(string $eventName, callable $listener): bool
+    {
+        // If it ends with a wildcard, we use the wildcardListeners array
+        if ('*' === $eventName[\strlen($eventName) - 1]) {
             $eventName = \substr($eventName, 0, -1);
-            $listeners = & $this->wildcardListeners;
+            $listeners = &$this->wildcardListeners;
         } else {
-            $listeners = & $this->listeners;
+            $listeners = &$this->listeners;
         }
 
         if (!isset($listeners[$eventName])) {
@@ -196,21 +175,17 @@ trait WildcardEmitterTrait {
         }
 
         foreach ($listeners[$eventName] as $index => $check) {
-
             if ($check[1] === $listener) {
-
                 // Remove listener
                 unset($listeners[$eventName][$index]);
                 // Reset index
                 $this->listenerIndex = [];
-                return true;
 
+                return true;
             }
-
         }
 
         return false;
-
     }
 
     /**
@@ -219,38 +194,32 @@ trait WildcardEmitterTrait {
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
-     *
-     * @return void
      */
-    function removeAllListeners(string $eventName = null) {
-
+    public function removeAllListeners(string $eventName = null)
+    {
         if (\is_null($eventName)) {
             $this->listeners = [];
             $this->wildcardListeners = [];
-
         } else {
-
-            if ($eventName[\strlen($eventName) - 1] === '*') {
+            if ('*' === $eventName[\strlen($eventName) - 1]) {
                 // Wildcard event
                 unset($this->wildcardListeners[\substr($eventName, 0, -1)]);
             } else {
                 unset($this->listeners[$eventName]);
             }
-
         }
 
         // Reset index
         $this->listenerIndex = [];
-
     }
 
     /**
-     * The list of listeners
+     * The list of listeners.
      */
     protected $listeners = [];
 
     /**
-     * The list of "wildcard listeners". 
+     * The list of "wildcard listeners".
      */
     protected $wildcardListeners = [];
 
diff --git a/vendor/sabre/event/lib/coroutine.php b/vendor/sabre/event/lib/coroutine.php
index 750e8ab52..a6a2baf41 100644
--- a/vendor/sabre/event/lib/coroutine.php
+++ b/vendor/sabre/event/lib/coroutine.php
@@ -1,4 +1,6 @@
-<?php declare (strict_types=1);
+<?php
+
+declare(strict_types=1);
 
 namespace Sabre\Event;
 
@@ -41,12 +43,13 @@ use Throwable;
  * });
  *
  * @return \Sabre\Event\Promise
+ *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-function coroutine(callable $gen) : Promise {
-
+function coroutine(callable $gen): Promise
+{
     $generator = $gen();
     if (!$generator instanceof Generator) {
         throw new \InvalidArgumentException('You must pass a generator function');
@@ -59,22 +62,20 @@ function coroutine(callable $gen) : Promise {
      * So tempted to use the mythical y-combinator here, but it's not needed in
      * PHP.
      */
-    $advanceGenerator = function() use (&$advanceGenerator, $generator, $promise, &$lastYieldResult) {
-
+    $advanceGenerator = function () use (&$advanceGenerator, $generator, $promise) {
         while ($generator->valid()) {
-
             $yieldedValue = $generator->current();
             if ($yieldedValue instanceof Promise) {
                 $yieldedValue->then(
-                    function($value) use ($generator, &$advanceGenerator, &$lastYieldResult) {
+                    function ($value) use ($generator, &$advanceGenerator) {
                         $generator->send($value);
                         $advanceGenerator();
                     },
-                    function(Throwable $reason) use ($generator, $advanceGenerator) {
+                    function (Throwable $reason) use ($generator, $advanceGenerator) {
                         $generator->throw($reason);
                         $advanceGenerator();
                     }
-                )->otherwise(function(Throwable $reason) use ($promise) {
+                )->otherwise(function (Throwable $reason) use ($promise) {
                     // This error handler would be called, if something in the
                     // generator throws an exception, and it's not caught
                     // locally.
@@ -87,31 +88,25 @@ function coroutine(callable $gen) : Promise {
                 // If the value was not a promise, we'll just let it pass through.
                 $generator->send($yieldedValue);
             }
-
         }
 
         // If the generator is at the end, and we didn't run into an exception,
         // We're grabbing the "return" value and fulfilling our top-level
         // promise with its value.
-         if (!$generator->valid() && $promise->state === Promise::PENDING) {
-             $returnValue = $generator->getReturn();
-
-             // The return value is a promise.
-             if ($returnValue instanceof Promise) {
-                 $returnValue->then(function($value) use ($promise) {
-                     $promise->fulfill($value);
-                 }, function(Throwable $reason) {
-                     $promise->reject($reason);
-                 });
-             } else {
-
-                 $promise->fulfill($returnValue);
-
-             }
-
-
+        if (!$generator->valid() && Promise::PENDING === $promise->state) {
+            $returnValue = $generator->getReturn();
+
+            // The return value is a promise.
+            if ($returnValue instanceof Promise) {
+                $returnValue->then(function ($value) use ($promise) {
+                    $promise->fulfill($value);
+                }, function (Throwable $reason) use ($promise) {
+                    $promise->reject($reason);
+                });
+            } else {
+                $promise->fulfill($returnValue);
+            }
         }
-
     };
 
     try {
@@ -121,5 +116,4 @@ function coroutine(callable $gen) : Promise {
     }
 
     return $promise;
-
 }
diff --git a/vendor/sabre/event/phpstan.neon b/vendor/sabre/event/phpstan.neon
new file mode 100644
index 000000000..213da6dad
--- /dev/null
+++ b/vendor/sabre/event/phpstan.neon
@@ -0,0 +1,2 @@
+parameters:
+  level: 1
diff --git a/vendor/sabre/event/phpunit.xml.dist b/vendor/sabre/event/phpunit.xml.dist
deleted file mode 100644
index ccd59be9c..000000000
--- a/vendor/sabre/event/phpunit.xml.dist
+++ /dev/null
@@ -1,18 +0,0 @@
-<phpunit
-  colors="true"
-  bootstrap="vendor/autoload.php"
-  convertErrorsToExceptions="true"
-  convertNoticesToExceptions="true"
-  convertWarningsToExceptions="true"
-  strict="true"
-  >
-  <testsuite name="sabre-event">
-    <directory>tests/</directory>
-  </testsuite>
-
-  <filter>
-    <whitelist addUncoveredFilesFromWhitelist="true">
-        <directory suffix=".php">./lib/</directory>
-   </whitelist>
-  </filter>
-</phpunit>