Update rdoc dependency to version 3.9.1
Update rdoc dependency to version 3.9.1

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