Upped 1.2 to 1.3 for feature completion

Author: WyriHaximus

README.md

@@ -42,7 +42,7 @@ For more examples see the [examples directory](examples).
 
 # Features
 
-This project aims to be 100% compatible with [Pusher's features](https://pusher.com/features) in `v1.2`.
+This project aims to be 100% compatible with [Pusher's features](https://pusher.com/features) in `v1.3`.
 
 - [X] Subscribe to channels
 - [ ] Presence channels