[ticket/13634] Update branch names on README

PHPBB3-13634

README.md

@@ -19,9 +19,9 @@ Find support and lots more on [phpBB.com](http://www.phpbb.com)! Discuss the dev
 
 We have unit and functional tests in order to prevent regressions. You can view the bamboo continuous integration [here](http://bamboo.phpbb.com) or check our travis build below:
 
-* develop [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop)](http://travis-ci.org/phpbb/phpbb)
-* develop-ascraeus [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop-ascraeus)](http://travis-ci.org/phpbb/phpbb)
-* develop-olympus [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop-olympus)](http://travis-ci.org/phpbb/phpbb)
+* [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop)](http://travis-ci.org/phpbb/phpbb) **master** - Latest development version
+* [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop-ascraeus)](http://travis-ci.org/phpbb/phpbb) **3.1.x** - Development of version 3.1.x
+* [![Build Status](https://secure.travis-ci.org/phpbb/phpbb.png?branch=develop-olympus)](http://travis-ci.org/phpbb/phpbb) **3.0.x** - Development of version 3.0.x
 
 ## LICENSE