Update minitest to version 5.6.1
Update minitest to version 5.6.1

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