heroku/heroku-buildpack-ruby — pull request #189 by brandondrew (2013-12-14 23:30:43+00:00)
Title: Update README to include Rails 4

I'm assuming everything works the same in Rails 4 as it does in Rails 3, and that the README just fails to mention Rails 4 as it was written before Rails 4 and never updated. If that is an incorrect assumption, please reject the pull request. If correct, then I'm updating it to remove any doubt about this fact.