Begin development on v4.0.1
Begin development on v4.0.1

Change-Id: I919736b08fa499c63260a9b226f3fd2a0a8383ab

SUPERCILEX/FirebaseUI-Android,firebase/FirebaseUI-Android,firebase/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android,firebase/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android,firebase/FirebaseUI-Android,SUPERCILEX/FirebaseUI-Android