Update changelog & API version

lib/google/api_client/version.rb

@@ -22,7 +22,7 @@ if !defined?(::Google::APIClient::VERSION)
       module VERSION
         MAJOR = 0
         MINOR = 4
-        TINY  = 2
+        TINY  = 3
 
         STRING = [MAJOR, MINOR, TINY].join('.')
       end