Removed Google+ link from README.md

Author: IanGClifton

README.md

@@ -66,7 +66,6 @@ Support
 -------
 
 - The "lint-dev" Google group: https://groups.google.com/forum/#!forum/lint-dev
-- Google+ Community: https://plus.google.com/communities/105153134372062985968
 - Stack Overflow: http://stackoverflow.com/questions/tagged/android
 
 If you've found an error in this sample, please file an issue: