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+*   The JavaScript WebSocket client will no longer try to reconnect
+    when you call `reject_unauthorized_connection` on the connection.
+
+    *Mick Staugaard*
+
+*   `ActionCable.Connection#getState` now references the configurable
+    `ActionCable.adapters.WebSocket` property rather than the `WebSocket` global
+    variable, matching the behavior of `ActionCable.Connection#open`.
+
+    *Richard Macklin*
+
+*   The ActionCable javascript package has been converted from CoffeeScript
+    to ES2015, and we now publish the source code in the npm distribution.
+
+    This allows ActionCable users to depend on the javascript source code
+    rather than the compiled code, which can produce smaller javascript bundles.
+
+    This change includes some breaking changes to optional parts of the
+    ActionCable javascript API:
+
+    - Configuration of the WebSocket adapter and logger adapter have been moved
+      from properties of `ActionCable` to properties of `ActionCable.adapters`.
+      If you are currently configuring these adapters you will need to make
+      these changes when upgrading:
+
+      ```diff
+      -    ActionCable.WebSocket = MyWebSocket
+      +    ActionCable.adapters.WebSocket = MyWebSocket
+      ```
+      ```diff
+      -    ActionCable.logger = myLogger
+      +    ActionCable.adapters.logger = myLogger
+      ```
+
+    - The `ActionCable.startDebugging()` and `ActionCable.stopDebugging()`
+      methods have been removed and replaced with the property
+      `ActionCable.logger.enabled`. If you are currently using these methods you
+      will need to make these changes when upgrading:
+
+      ```diff
+      -    ActionCable.startDebugging()
+      +    ActionCable.logger.enabled = true
+      ```
+      ```diff
+      -    ActionCable.stopDebugging()
+      +    ActionCable.logger.enabled = false
+      ```
+
+    *Richard Macklin*
+
+*   Add `id` option to redis adapter so now you can distinguish
+    ActionCable's redis connections among others. Also, you can set
+    custom id in options.
+
+    Before:
+    ```
+    $ redis-cli client list
+    id=669 addr=127.0.0.1:46442 fd=8 name= age=18 ...
+    ```
+
+    After:
+    ```
+    $ redis-cli client list
+    id=673 addr=127.0.0.1:46516 fd=8 name=ActionCable-PID-19413 age=2 ...
+    ```
+
+    *Ilia Kasianenko*
+
+*   Rails 6 requires Ruby 2.5.0 or newer.
+
+    *Jeremy Daer*, *Kasper Timm Hansen*
+
+
+Please check [5-2-stable](https://github.com/rails/rails/blob/5-2-stable/actioncable/CHANGELOG.md) for previous changes.