Removed comment about Google Group

Author: hallem

README.markdown

@@ -1,7 +1,6 @@
 # RestSharp - Simple .NET REST Client [![Build status](https://ci.appveyor.com/api/projects/status/5vdwwducje0miayf?svg=true)](https://ci.appveyor.com/project/hallem/restsharp)
 
 ### [Official Site/Blog][1] - [@RestSharp][2]  
-### Please use the [Google Group][3] for feature requests and troubleshooting usage.
 ### License: Apache License 2.0
 
 ### Features