README.md in rubyserial-0.2.3 vs README.md in rubyserial-0.2.4

- old
+ new
@@ -6,9 +6,10 @@
 
 The interface to RubySerial should be (mostly) compatible with other Ruby serialport gems, so you should be able to drop in the new gem, change the `require` and use it as a replacement. If not, please let us know so we can address any issues.
 
 [![Build Status](https://travis-ci.org/hybridgroup/rubyserial.svg)](https://travis-ci.org/hybridgroup/rubyserial)
 [![Build status](https://ci.appveyor.com/api/projects/status/946nlaqy4443vb99/branch/master?svg=true)](https://ci.appveyor.com/project/zankich/rubyserial/branch/master)
+[![Test Coverage](https://codeclimate.com/github/hybridgroup/rubyserial/badges/coverage.svg)](https://codeclimate.com/github/hybridgroup/rubyserial/coverage)
 
 ## Installation
 
     $ gem install rubyserial