Merge pull request LibrePDF#46 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

README.md

@@ -2,7 +2,7 @@
 
 OpenPDF is a Java library for creating and editing PDF files with a LGPL and MPL open source license. OpenPDF is based on a fork of iText 4. We welcome contributions from other developers. Please feel free to submit pull-requests and bugreports to this GitHub repository.
 
-[![Build Status](https://api.travis-ci.org/LibrePDF/OpenPDF.png)](https://travis-ci.org/LibrePDF/OpenPDF) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.librepdf/openpdf/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.librepdf/openpdf) [![License (LGPL version 3.0)](https://img.shields.io/badge/license-GNU%20LGPL%20version%203.0-blue.svg?style=flat-square)](http://opensource.org/licenses/LGPL-3.0) [![License (MPL)](https://img.shields.io/badge/license-Mozilla%20Public%20License-yellow.svg?style=flat-square)](http://opensource.org/licenses/MPL-2.0)
+[![Join the chat at https://gitter.im/LibrePDF/OpenPDF](https://badges.gitter.im/LibrePDF/OpenPDF.svg)](https://gitter.im/LibrePDF/OpenPDF?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Build Status](https://api.travis-ci.org/LibrePDF/OpenPDF.png)](https://travis-ci.org/LibrePDF/OpenPDF) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.librepdf/openpdf/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.librepdf/openpdf) [![License (LGPL version 3.0)](https://img.shields.io/badge/license-GNU%20LGPL%20version%203.0-blue.svg?style=flat-square)](http://opensource.org/licenses/LGPL-3.0) [![License (MPL)](https://img.shields.io/badge/license-Mozilla%20Public%20License-yellow.svg?style=flat-square)](http://opensource.org/licenses/MPL-2.0)
 
 ## OpenPDF version 1.0.4 released 2017-10-11 ##
 Get version 1.0.4 here - https://github.com/LibrePDF/OpenPDF/releases/tag/1.0.4