📝 Update didChangeAudioRoute documentation

Based on the code in `android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java` and `ios/RNCallKeep/RNCallKeep.m`

Author: homersimpsons

README.md

@@ -845,20 +845,24 @@ RNCallKeep.addEventListener('didToggleHoldCallAction', ({ hold, callUUID }) => {
 });
 ```
 
+- `hold` (boolean)
+- `callUUID` (string)
+  - The UUID of the call.
+
 ### - didChangeAudioRoute
 
 Triggered when the audio route has been changed.
-⚠️ Will send `Speaker` on iOS but `SPEAKER` on Android.
 
 ```js
 RNCallKeep.addEventListener('didChangeAudioRoute', ({ output }) => {
 
 });
 ```
 
-- `hold` (boolean)
-- `callUUID` (string)
-  - The UUID of the call.
+- `output` (string) ⚠️ Will send `Speaker` on iOS but `SPEAKER` on Android.
+- `reason` (number, iOS only) See case's in https://developer.apple.com/documentation/avfaudio/avaudiosession/routechangereason
+- `handle` (string, Android only) Phone number of the incoming caller
+- `callUUID` (string, Android only) The UUID of the call
 
 ### - didPerformDTMFAction