README.md in ahoy_email-0.3.2 vs README.md in ahoy_email-0.4.0

@@ -12,9 +12,11 @@
 
 :bullettrain_side: To manage unsubscribes, check out [Mailkick](https://github.com/ankane/mailkick)
 
 :fire: To track visits and events, check out [Ahoy](https://github.com/ankane/ahoy)
 
+[![Build Status](https://travis-ci.org/ankane/ahoy_email.svg?branch=master)](https://travis-ci.org/ankane/ahoy_email)
+
 ## Installation
 
 Add this line to your application’s Gemfile:
 
 ```ruby