Update puma dependency to version 2.7.1
Update puma dependency to version 2.7.1

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