Update coveralls dependency to version 0.6.7
Update coveralls dependency to version 0.6.7

codeforamerica/follow-all,BryanH/follow-all,BryanH/follow-all,codeforamerica/follow-all,jasnow/follow-all,jasnow/follow-all,BryanH/follow-all,codeforamerica/follow-all,jasnow/follow-all