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diff --git a/vendor/sabre/xml/lib/Serializer/functions.php b/vendor/sabre/xml/lib/Serializer/functions.php
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+++ b/vendor/sabre/xml/lib/Serializer/functions.php
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+<?php
+
+namespace Sabre\Xml\Serializer;
+
+use InvalidArgumentException;
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * This file provides a number of 'serializer' helper functions.
+ *
+ * These helper functions can be used to easily xml-encode common PHP
+ * data structures, or can be placed in the $classMap.
+ */
+
+/**
+ * The 'enum' serializer writes simple list of elements.
+ *
+ * For example, calling:
+ *
+ * enum($writer, [
+ *   "{http://sabredav.org/ns}elem1",
+ *   "{http://sabredav.org/ns}elem2",
+ *   "{http://sabredav.org/ns}elem3",
+ *   "{http://sabredav.org/ns}elem4",
+ *   "{http://sabredav.org/ns}elem5",
+ * ]);
+ *
+ * Will generate something like this (if the correct namespace is declared):
+ *
+ * <s:elem1 />
+ * <s:elem2 />
+ * <s:elem3 />
+ * <s:elem4>content</s:elem4>
+ * <s:elem5 attr="val" />
+ *
+ * @param Writer $writer
+ * @param string[] $values
+ * @return void
+ */
+function enum(Writer $writer, array $values) {
+
+    foreach ($values as $value) {
+        $writer->writeElement($value);
+    }
+}
+
+/**
+ * The valueObject serializer turns a simple PHP object into a classname.
+ *
+ * Every public property will be encoded as an xml element with the same
+ * name, in the XML namespace as specified.
+ *
+ * Values that are set to null or an empty array are not serialized. To
+ * serialize empty properties, you must specify them as an empty string.
+ *
+ * @param Writer $writer
+ * @param object $valueObject
+ * @param string $namespace
+ */
+function valueObject(Writer $writer, $valueObject, $namespace) {
+    foreach (get_object_vars($valueObject) as $key => $val) {
+        if (is_array($val)) {
+            // If $val is an array, it has a special meaning. We need to
+            // generate one child element for each item in $val
+            foreach ($val as $child) {
+                $writer->writeElement('{' . $namespace . '}' . $key, $child);
+            }
+
+        } elseif ($val !== null) {
+            $writer->writeElement('{' . $namespace . '}' . $key, $val);
+        }
+    }
+}
+
+
+/**
+ * This serializer helps you serialize xml structures that look like
+ * this:
+ *
+ * <collection>
+ *    <item>...</item>
+ *    <item>...</item>
+ *    <item>...</item>
+ * </collection>
+ *
+ * In that previous example, this serializer just serializes the item element,
+ * and this could be called like this:
+ *
+ * repeatingElements($writer, $items, '{}item');
+ *
+ * @param Writer $writer
+ * @param array $items A list of items sabre/xml can serialize.
+ * @param string $childElementName Element name in clark-notation
+ * @return void
+ */
+function repeatingElements(Writer $writer, array $items, $childElementName) {
+
+    foreach ($items as $item) {
+        $writer->writeElement($childElementName, $item);
+    }
+
+}
+
+/**
+ * This function is the 'default' serializer that is able to serialize most
+ * things, and delegates to other serializers if needed.
+ *
+ * The standardSerializer supports a wide-array of values.
+ *
+ * $value may be a string or integer, it will just write out the string as text.
+ * $value may be an instance of XmlSerializable or Element, in which case it
+ *    calls it's xmlSerialize() method.
+ * $value may be a PHP callback/function/closure, in case we call the callback
+ *    and give it the Writer as an argument.
+ * $value may be a an object, and if it's in the classMap we automatically call
+ *    the correct serializer for it.
+ * $value may be null, in which case we do nothing.
+ *
+ * If $value is an array, the array must look like this:
+ *
+ * [
+ *    [
+ *       'name' => '{namespaceUri}element-name',
+ *       'value' => '...',
+ *       'attributes' => [ 'attName' => 'attValue' ]
+ *    ]
+ *    [,
+ *       'name' => '{namespaceUri}element-name2',
+ *       'value' => '...',
+ *    ]
+ * ]
+ *
+ * This would result in xml like:
+ *
+ * <element-name xmlns="namespaceUri" attName="attValue">
+ *   ...
+ * </element-name>
+ * <element-name2>
+ *   ...
+ * </element-name2>
+ *
+ * The value property may be any value standardSerializer supports, so you can
+ * nest data-structures this way. Both value and attributes are optional.
+ *
+ * Alternatively, you can also specify the array using this syntax:
+ *
+ * [
+ *    [
+ *       '{namespaceUri}element-name' => '...',
+ *       '{namespaceUri}element-name2' => '...',
+ *    ]
+ * ]
+ *
+ * This is excellent for simple key->value structures, and here you can also
+ * specify anything for the value.
+ *
+ * You can even mix the two array syntaxes.
+ *
+ * @param Writer $writer
+ * @param string|int|float|bool|array|object
+ * @return void
+ */
+function standardSerializer(Writer $writer, $value) {
+
+    if (is_scalar($value)) {
+
+        // String, integer, float, boolean
+        $writer->text($value);
+
+    } elseif ($value instanceof XmlSerializable) {
+
+        // XmlSerializable classes or Element classes.
+        $value->xmlSerialize($writer);
+
+    } elseif (is_object($value) && isset($writer->classMap[get_class($value)])) {
+
+        // It's an object which class appears in the classmap.
+        $writer->classMap[get_class($value)]($writer, $value);
+
+    } elseif (is_callable($value)) {
+
+        // A callback
+        $value($writer);
+
+    } elseif (is_null($value)) {
+
+        // nothing!
+
+    } elseif (is_array($value) && array_key_exists('name', $value)) {
+
+        // if the array had a 'name' element, we assume that this array
+        // describes a 'name' and optionally 'attributes' and 'value'.
+
+        $name = $value['name'];
+        $attributes = isset($value['attributes']) ? $value['attributes'] : [];
+        $value = isset($value['value']) ? $value['value'] : null;
+
+        $writer->startElement($name);
+        $writer->writeAttributes($attributes);
+        $writer->write($value);
+        $writer->endElement();
+
+    } elseif (is_array($value)) {
+
+        foreach ($value as $name => $item) {
+
+            if (is_int($name)) {
+
+                // This item has a numeric index. We just loop through the
+                // array and throw it back in the writer.
+                standardSerializer($writer, $item);
+
+            } elseif (is_string($name) && is_array($item) && isset($item['attributes'])) {
+
+                // The key is used for a name, but $item has 'attributes' and
+                // possibly 'value'
+                $writer->startElement($name);
+                $writer->writeAttributes($item['attributes']);
+                if (isset($item['value'])) {
+                    $writer->write($item['value']);
+                }
+                $writer->endElement();
+
+            } elseif (is_string($name)) {
+
+                // This was a plain key-value array.
+                $writer->startElement($name);
+                $writer->write($item);
+                $writer->endElement();
+
+            } else {
+
+                throw new InvalidArgumentException('The writer does not know how to serialize arrays with keys of type: ' . gettype($name));
+
+            }
+        }
+
+    } elseif (is_object($value)) {
+
+        throw new InvalidArgumentException('The writer cannot serialize objects of class: ' . get_class($value));
+
+    } else {
+
+        throw new InvalidArgumentException('The writer cannot serialize values of type: ' . gettype($value));
+
+    }
+
+}