### Changes

* Enables passing credentials via environment variables. ([@haabaato][])
[#27](https://github.com/google/google-auth-library-ruby/issues/27)

## 0.4.1 (25/04/2015)

### Changes

* Improves handling of --no-scopes GCE authorization ([@tbetbetbe][])
* Refactoring and cleanup ([@joneslee85][])

## 0.4.0 (25/03/2015)

### Changes

* Adds an implementation of JWT header auth ([@tbetbetbe][])

## 0.3.0 (23/03/2015)

### Changes

* makes the scope parameter's optional in all APIs. ([@tbetbetbe][])
* changes the scope parameter's position in various constructors. ([@tbetbetbe][])

[@tbetbetbe]: https://github.com/tbetbetbe
[@joneslee85]: https://github.com/joneslee85
[@haabaato]: https://github.com/haabaato