docs: update CHANGELOG

Author: cybex-dev

CHANGELOG.md

@@ -1,5 +1,14 @@
 ## Next Release
 
+* BREAKING CHANGES:
+  * Feat: Completed migration to Federated Plugin structure. This requires one change:
+  ```dart
+  /// old
+  TwilioVoice.instance
+  
+  // new 
+  TwilioVoicePlatform.instance
+  ```
 * Feat: [Web] Add Twilio Device [DeviceState] accessor protecting un/registration.
 * Feat: [Web] Add Twilio Device `updateToken(String)` function to allow updating of active device tokens.
 * Fix: [Web] Twilio Device does not unregister on `unregister()` method call due to 'device.off' not visible in js object causing device event listeners to remain attached on unregistered device.