Recache coverage badge

README.rst

@@ -1,7 +1,7 @@
 .. image:: https://travis-ci.org/torchbox/wagtail.png?branch=master
     :target: https://travis-ci.org/torchbox/wagtail
 
-.. image:: https://coveralls.io/repos/torchbox/wagtail/badge.png?branch=master
+.. image:: https://coveralls.io/repos/torchbox/wagtail/badge.png?branch=master&zxcv
     :target: https://coveralls.io/r/torchbox/wagtail?branch=master 
 
 .. image:: https://pypip.in/v/wagtail/badge.png?zxcv