added shippable build status icon to readme

Author: John Doherty

README.MD

@@ -1,6 +1,6 @@
 [![stats](https://nodei.co/npm/selenium-cucumber-js.png?downloads=true)](https://www.npmjs.com/package/selenium-cucumber-js)
 
-# selenium-cucumber-js
+# selenium-cucumber-js [![Run Status](https://api.shippable.com/projects/5818b23bbd56670e00037040/badge?branch=master)](https://app.shippable.com/projects/5818b23bbd56670e00037040)
 
 A debuggable JS BDD framework that uses the official [selenium-webdriver](http://seleniumhq.github.io/selenium/docs/api/javascript/ "view webdriver js documentation") for Node and [cucumber-js](https://github.com/cucumber/cucumber-js "view cucumber js documentation").