Update pubspec.yaml (#236)
Update pubspec.yaml (#236)

Rev version number in prep for publishing changes from https://github.com/flutter/plugins/pull/214. Changelog was already updated in that PR.
googleads/googleads-mobile-flutter,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,firebase/flutterfire,googleads/googleads-mobile-flutter,firebase/flutterfire,firebase/flutterfire,googleads/googleads-mobile-flutter,firebase/flutterfire,googleads/googleads-mobile-flutter,firebase/flutterfire