tpope/vim-bundler — pull request #8 by cbartlett (2012-06-23 01:23:37+00:00)
Title: Syntax highlight ruby version specification

Bundler 1.2.0pre add ruby to the DSL for specifying the ruby version.

https://github.com/carlhuda/bundler/blob/a63bdd32736ea176dbf6ae68cc54a1f398e557d9/CHANGELOG.md

As of 8/1/2012, this is the only way Heroku will support ruby version specification.