Changed Gitter badge to the Shields version.

Author: Roman Syroeshko

README.md

@@ -1,13 +1,12 @@
 # ![PHPWord](https://rawgit.com/PHPOffice/PHPWord/develop/docs/images/phpword.svg "PHPWord")
 
-[![Join the chat at https://gitter.im/PHPOffice/PHPWord](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/PHPOffice/PHPWord?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-
 [![Latest Stable Version](https://poser.pugx.org/phpoffice/phpword/v/stable.png)](https://packagist.org/packages/phpoffice/phpword)
 [![Build Status](https://travis-ci.org/PHPOffice/PHPWord.svg?branch=master)](https://travis-ci.org/PHPOffice/PHPWord)
 [![Code Quality](https://scrutinizer-ci.com/g/PHPOffice/PHPWord/badges/quality-score.png?s=b5997ce59ac2816b4514f3a38de9900f6d492c1d)](https://scrutinizer-ci.com/g/PHPOffice/PHPWord/)
 [![Code Coverage](https://scrutinizer-ci.com/g/PHPOffice/PHPWord/badges/coverage.png?s=742a98745725c562955440edc8d2c39d7ff5ae25)](https://scrutinizer-ci.com/g/PHPOffice/PHPWord/)
 [![Total Downloads](https://poser.pugx.org/phpoffice/phpword/downloads.png)](https://packagist.org/packages/phpoffice/phpword)
 [![License](https://poser.pugx.org/phpoffice/phpword/license.png)](https://packagist.org/packages/phpoffice/phpword)
+[![Join the chat at https://gitter.im/PHPOffice/PHPWord](https://img.shields.io/badge/GITTER-join%20chat-green.svg)](https://gitter.im/PHPOffice/PHPWord)
 
 PHPWord is a library written in pure PHP that provides a set of classes to write to and read from different document file formats. The current version of PHPWord supports Microsoft [Office Open XML](http://en.wikipedia.org/wiki/Office_Open_XML) (OOXML or OpenXML), OASIS [Open Document Format for Office Applications](http://en.wikipedia.org/wiki/OpenDocument) (OpenDocument or ODF), [Rich Text Format](http://en.wikipedia.org/wiki/Rich_Text_Format) (RTF), HTML, and PDF.