Update README.md

Author: Igor Khomenko

README.md

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 [![npm](https://img.shields.io/npm/v/quickblox.svg)]()
 [![npm](https://img.shields.io/npm/dm/quickblox.svg)]()
+[travis-ci](https://api.travis-ci.org/QuickBlox/quickblox-javascript-sdk.svg?branch=gh-pages)
 
 The QuickBlox JavaScript SDK provides a JavaScript library making it even
 easier to access the QuickBlox cloud communication backend platform.