Travis builds are doing using Ruby 1.9, however, newer versions of ohai require Ruby 2.
Gem::InstallError: ohai requires Ruby version >= 2.0.0.
An error occurred while installing ohai (8.3.0), and Bundler cannot continue.
Make sure that `gem install ohai -v '8.3.0'` succeeds before bundling.
Travis builds are doing using Ruby 1.9, however, newer versions of ohai require Ruby 2.