Bump gem version to 2.5.0

Bump to version 2.4.1

Bump version to 2.3.1

Bump version to 2.3.0

Version bump to 2.2.0

Bump version to 0.2.1

Bump version to 2.0.1

Bump version to 2.0.0

Seems like a big bump for a minor change but since I'm removing
Rails 2.3 support I want to stick to semantic versioning and do a
major non-backwards-compatible release.

Bump version to 1.0.0!

Bump version to 0.3.0