[Travis] update travis badge to match current branch

README.md

@@ -2,6 +2,6 @@
 
 Helios is an end-to-end verifiable voting system.
 
-![Travis Build Status](https://travis-ci.org/benadida/helios-server.svg?branch=master)
+[![Travis Build Status](https://travis-ci.org/McCio/helios-server.svg?branch=django-1.11)](https://travis-ci.org/McCio/helios-server)
 
 [![Stories in Ready](https://badge.waffle.io/benadida/helios-server.png?label=ready&title=Ready)](https://waffle.io/benadida/helios-server)