Update README.md

lgierth · Jun 27, 2014 · 209dd01 · 209dd01
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 # promise.rb [![Build Status](https://travis-ci.org/lgierth/promise.rb.png?branch=master)](https://travis-ci.org/lgierth/promise.rb) [![Code Climate](https://codeclimate.com/github/lgierth/promise.rb.png)](https://codeclimate.com/github/lgierth/promise.rb) [![Coverage Status](https://coveralls.io/repos/lgierth/promise.rb/badge.png?branch=master)](https://coveralls.io/r/lgierth/promise.rb?branch=master)
 
 Ruby implementation of the [Promises/A+ spec](http://promisesaplus.com/).
-100% [mutation coverage](https://github.com/mbj/mutant), tested on 1.9, 2.0, Rubinius, and JRuby.
+100% [mutation coverage](https://github.com/mbj/mutant),
+tested on MRI 1.9, 2.0, 2.1, Rubinius, and JRuby.
 
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