Update puma to version 2.16.0
Update puma to version 2.16.0

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