wayneeseguin/rvm — pull request #2458 by crq0 (2013-12-24 23:39:13+00:00)
Title: Added rubygems 2.2.0.rc.1 for ruby-2.1.0-rc1

This is the correct version.

From the release notes: https://www.ruby-lang.org/en/news/2013/12/20/ruby-2-1-0-rc1-is-released/