Fix coveralls.io badge

Author: ad-m

README.rst

@@ -1,7 +1,8 @@
 .. image:: https://travis-ci.org/dominicrodger/django-tinycontent.svg
     :target: https://travis-ci.org/dominicrodger/django-tinycontent
 
-.. image:: https://coveralls.io/repos/dominicrodger/django-tinycontent/badge.svg?branch=master&service=github :target: https://coveralls.io/github/dominicrodger/django-tinycontent?branch=master
+.. image:: https://coveralls.io/repos/dominicrodger/django-tinycontent/badge.svg?branch=master&service=github
+    :target: https://coveralls.io/github/dominicrodger/django-tinycontent?branch=master
 
 django-tinycontent is a simple Django application for re-usable
 content blocks, much like `django-boxes`_.