Update thread_safe to version 0.3.5
Update thread_safe to version 0.3.5

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