Removed Travis CI config

Author: jtreanor

.travis.yml

@@ -1,6 +1,6 @@
 <h1><img align="center" width=50px height=50px src="https://github.com/wordpress-mobile/AztecEditor-iOS/raw/develop/RepoAssets/aztec.png" alt="Aztec Logo"/>&nbsp;Aztec: Native HTML Editor for Android</h1>
 
-[![Build Status](https://travis-ci.org/wordpress-mobile/AztecEditor-Android.svg?branch=develop)](https://travis-ci.org/wordpress-mobile/AztecEditor-Android)
+[![CircleCI](https://circleci.com/gh/wordpress-mobile/AztecEditor-Android.svg?style=svg)](https://circleci.com/gh/wordpress-mobile/AztecEditor-Android)
 
 Aztec (which extends EditText) is a rich-text editor component for writing HTML
 documents in Android.