Update version to 3.0.0b2.post2

python/google/protobuf/__init__.py

@@ -30,7 +30,7 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.0.0b2'
+__version__ = '3.0.0b2.post2'
 
 if __name__ != '__main__':
   try: