Add bountysource tag to README

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://travis-ci.org/chamilo/chamilo-lms.svg?branch=1.10.x)](https://travis-ci.org/chamilo/chamilo-lms)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/chamilo/chamilo-lms/badges/quality-score.png?b=1.10.x)](https://scrutinizer-ci.com/g/chamilo/chamilo-lms/?branch=1.10.x)
 [![Code Coverage](https://scrutinizer-ci.com/g/chamilo/chamilo-lms/badges/coverage.png?b=1.10.x)](https://scrutinizer-ci.com/g/chamilo/chamilo-lms/?branch=1.10.x)
+[![Bountysource](https://www.bountysource.com/badge/team?team_id=12439&style=raised)](https://www.bountysource.com/teams/chamilo?utm_source=chamilo&utm_medium=shield&utm_campaign=raised)
 
 ## Installation