README.md in message-driver-0.3.0 vs README.md in message-driver-0.4.0

- old
+ new

@@ -8,9 +8,11 @@
 
 [![Dependency Status](https://gemnasium.com/message-driver/message-driver.png)](https://gemnasium.com/message-driver/message-driver)
 
 [![Code Climate](https://codeclimate.com/github/message-driver/message-driver.png)](https://codeclimate.com/github/message-driver/message-driver)
 
+[![Coverage Status](https://img.shields.io/coveralls/message-driver/message-driver.svg)](https://coveralls.io/r/message-driver/message-driver)
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
     gem 'message-driver'