This release relaxes the omniauth version requirement to allow omniauth v2.0.0.
While v2.0.0 of this gem was tagged for a while, it was never pushed to rubygems. It removed the "steam" strategy from the gem, and so was tagged as a breaking change.
If you need a steam strategy, you can try omniauth-steam, but this is neither a guarantee of functionality nor an official recommendation.