[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) 

Bumped version to 3.2.0 (firebase#366) 

Bumped version to 3.1.0 (firebase#358) 

Bumped version to 3.0.0 (firebase#344) 

Bumped version to 2.18.0 (firebase#333) * Bumped version to 2.18.0 * Removing extra whitespace