Bump google_maps_flutter pubspec to match CHANGELOG (flutter#2267)

Author: jmagman

packages/google_maps_flutter/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 author: Flutter Team <[email protected]>
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter
-version: 0.5.21+9
+version: 0.5.21+10
 
 dependencies:
   flutter: