intridea/omniauth-oauth2

## [v1.8.0](https://github.com/omniauth/omniauth-oauth2/releases/tag/v1.7.3)
- Relaxes allowed versions of the oauth2 gem. [#146](https://github.com/omniauth/omniauth-oauth2/pull/146)
- Requires omniauth `~> 2.0` [#152](https://github.com/omniauth/omniauth-oauth2/pull/152) 

Please see https://github.com/omniauth/omniauth-oauth2/releases for changelog prior to 1.8.0