Update build badge URL on README

Author: jbpros

README.md

@@ -1,5 +1,5 @@
 # Cucumber.js
-  [![Build Status](https://secure.travis-ci.org/cucumber/cucumber-js.png?branch=master)](http://travis-ci.org/cucumber/cucumber-js)
+  [![Build Status](https://travis-ci.org/cucumber/cucumber-js.png?branch=master)](https://travis-ci.org/cucumber/cucumber-js)
   [![Dependencies](https://david-dm.org/cucumber/cucumber-js.png)](https://david-dm.org/cucumber/cucumber-js) [![Code Climate](https://codeclimate.com/github/cucumber/cucumber-js.png)](https://codeclimate.com/github/cucumber/cucumber-js)
 
 [![NPM](https://nodei.co/npm/cucumber.png?stars&downloads)](https://nodei.co/npm/cucumber/)