Add Travis badge.

tgxworld · tgxworld · commit b957507ac6fd · 2015-05-27T16:37:32.000+08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # Rails::Controller::Testing
 
+[![Build Status](https://travis-ci.org/tgxworld/rails-controller-testing.svg?branch=master)](https://travis-ci.org/tgxworld/rails-controller-testing)
+
 This gem brings back `assigns` to your controller tests as well as `assert_template`
 to both controller and integration tests.
 
