Merge pull request #338 from Progi1984/issue225

#225 : Links in Readme.md & Travis CI (PHP 7.1)

Author: Progi1984

.travis.yml

@@ -7,6 +7,7 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 
 matrix:

README.md

@@ -1,13 +1,15 @@
 # ![PHPPresentation](https://raw.githubusercontent.com/mvargasmoran/PHPPresentation/develop/docs/images/PHPPresentationLogo.png "PHPPresentation")
 
 [![Latest Stable Version](https://poser.pugx.org/phpoffice/phppresentation/v/stable.png)](https://packagist.org/packages/phpoffice/phppresentation)
-[![Build Status](https://travis-ci.org/PHPOffice/PHPPresentation.svg?branch=master)](https://travis-ci.org/PHPOffice/PHPPresentation)
 [![Code Climate](https://codeclimate.com/github/PHPOffice/PHPPresentation/badges/gpa.svg)](https://codeclimate.com/github/PHPOffice/PHPPresentation)
 [![Test Coverage](https://codeclimate.com/github/PHPOffice/PHPPresentation/badges/coverage.svg)](https://codeclimate.com/github/PHPOffice/PHPPresentation/coverage)
 [![Total Downloads](https://poser.pugx.org/phpoffice/phppresentation/downloads.png)](https://packagist.org/packages/phpoffice/phppresentation)
 [![License](https://poser.pugx.org/phpoffice/phppresentation/license.png)](https://packagist.org/packages/phpoffice/phppresentation)
+[![BountySource](https://img.shields.io/bountysource/team/phpoffice/activity.svg)](https://www.bountysource.com/teams/phpoffice)
 [![Join the chat at https://gitter.im/PHPOffice/PHPPresentation](https://img.shields.io/badge/GITTER-join%20chat-green.svg)](https://gitter.im/PHPOffice/PHPPresentation)
 
+Branch Master : [![Build Status](https://travis-ci.org/PHPOffice/PHPPresentation.svg?branch=master)](https://travis-ci.org/PHPOffice/PHPPresentation) [![Documentation Status](https://readthedocs.org/projects/phppresentation/badge/?version=master)](http://phppresentation.readthedocs.io/en/latest/?badge=master)  
+Branch Develop : [![Build Status](https://travis-ci.org/PHPOffice/PHPPresentation.svg?branch=develop)](https://travis-ci.org/PHPOffice/PHPPresentation) [![Documentation Status](https://readthedocs.org/projects/phppresentation/badge/?version=develop)](http://phppresentation.readthedocs.io/en/latest/?badge=develop)
 
 PHPPresentation is a library written in pure PHP that provides a set of classes to write to different presentation file formats, i.e. Microsoft [Office Open XML](http://en.wikipedia.org/wiki/Office_Open_XML) (OOXML or OpenXML) or OASIS [Open Document Format for Office Applications](http://en.wikipedia.org/wiki/OpenDocument) (OpenDocument or ODF).