Adding note about pusher-rest -> pusher package naming as of 1.0

Author: leggetter

README.md

@@ -30,6 +30,8 @@ normally `easy_install` or `pip`. For example:
 pip install pusher-rest
 ```
 
+**Note: When 1.0 is reached `pusher-rest` will no longer be updated. Instead `pusher` should be used**
+
 Getting started
 ---------------