Replaced subscribeToDiscontinuities with onDiscontinuity.

README.md

@@ -230,13 +230,13 @@ There may be instances where the connection to Ably is lost for a period of time
 circumstances, the connection will recover and operation will continue with no discontinuity of messages. However, during extended
 periods of disconnection, continuity cannot be guaranteed and you'll need to take steps to recover messages you might have missed.
 
-Each feature of the Chat SDK provides an `subscribeToDiscontinuities` method. Here you can register a listener that will be notified whenever a
+Each feature of the Chat SDK provides an `onDiscontinuity` method. Here you can register a listener that will be notified whenever a
 discontinuity in that feature has been observed.
 
 Taking messages as an example, you can listen for discontinuities like so:
 
 ```swift
-let subscription = room.messages.subscribeToDiscontinuities()
+let subscription = room.messages.onDiscontinuity()
 for await error in subscription {
     print("Recovering from the error: \(error)")
 }