Update README.rst

README.rst

@@ -3,7 +3,7 @@ django-extra-views - The missing class-based generic views for Django
 
 Django's class-based generic views are great, they let you accomplish a large number of web application design patterns in relatively few lines of code.  They do have their limits though, and that's what this library of views aims to overcome.
 
-.. image:: https://api.travis-ci.org/AndrewIngram/django-extra-views.png?branch=master
+.. image:: https://secure.travis-ci.org/AndrewIngram/django-extra-views.svg?branch=master
         :target: https://travis-ci.org/AndrewIngram/django-extra-views
 
 .. image:: https://pypip.in/d/django-extra-views/badge.png