[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