Revert "Removes the Coveralls badge since it's mysteriously not working."
Revert "Removes the Coveralls badge since it's mysteriously not working."

This reverts commit c3846d7799024b502b7208bc4c2a8f4071242f0f.

BertrandBordage/django-terms,philippeowagner/django-terms,philippeowagner/django-terms,BertrandBordage/django-terms