docs: add build status to REDME.md

Author: Michał Jaworski

README.md

@@ -1,4 +1,5 @@
-[![WTFPL](http://www.wtfpl.net/wp-content/uploads/2012/12/wtfpl-badge-4.png)](http://www.wtfpl.net/)
+[![WTFPL](http://www.wtfpl.net/wp-content/uploads/2012/12/wtfpl-badge-4.png)](http://www.wtfpl.net/) 
+[![Build Status](https://travis-ci.org/swistakm/ianitor.svg?branch=master)](https://travis-ci.org/swistakm/ianitor)
 
 # ianitor