Update puma dependency to version 2.7.0
Update puma dependency to version 2.7.0

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