Update thor dependency to version 0.18.1
Update thor dependency to version 0.18.1

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