Version bump for 2.0.0 release?

[fuegas]

Hi,

Thanks for this gem! I saw that you created a release for 2.0.0, but the version.rb file still states 1.5.1. Could you bump that file as well? 😄 Thanks!

If you're working on it, would it be possible to publish a release on RubyGems as well? 😄

[opensourceame]

+1 for pushing some new versions to RubyGems as it gives a better impression that this gem is maintained.