[chore] Release 4.5.2 (firebase#533) - Release 4.5.2

[chore] Release 4.5.1 (firebase#527) 

[chore] Release 4.5.0 (firebase#516) 

[chore] Release 4.4.0 Take 2 

[chore] Release 4.3.0 (firebase#462) 

[chore] Release 4.2.0 (firebase#457) 

[chore] Release 4.1.0 

[chore] Release 4.0.1 (firebase#434) 

[chore] Release 4.0.0 (firebase#415) 

Bumped version to 3.2.1 (firebase#374)