Update rack dependency to version 1.3.3
Update rack dependency to version 1.3.3

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