rails/rails — pull request #11558 by kennyj (2013-07-22 17:57:10+00:00)
Title: Uses mysql2 0.3.13 or later.

We merged d97269dac70155be19b0a1ee4e1d988988aaebdb.
But in the `mysql2_adapter.rb`, we still use `mysql2 gem 0.3.10 or later`.
So I think we bump gem version in the file.