added coveralls badge

readme.md

@@ -8,8 +8,9 @@ JavaScript obfuscator for Node.js is a free alternative to [js-obfuscator](https
 
 https://gist.github.com/sanex3339/ffc2876123b52e6d11ce45369fd53acf
 
-[![Build Status](https://travis-ci.org/sanex3339/javascript-obfuscator.svg?branch=master)](https://travis-ci.org/sanex3339/javascript-obfuscator)
 [![npm version](https://badge.fury.io/js/javascript-obfuscator.svg)](https://badge.fury.io/js/javascript-obfuscator)
+[![Build Status](https://travis-ci.org/sanex3339/javascript-obfuscator.svg?branch=master)](https://travis-ci.org/sanex3339/javascript-obfuscator)
+[![Coverage Status](https://coveralls.io/repos/github/sanex3339/javascript-obfuscator/badge.svg?branch=master)](https://coveralls.io/github/sanex3339/javascript-obfuscator?branch=master)
 
 ## Installation