bump version to 3.1.0. py3 support!
bump version to 3.1.0. py3 support!

TetraEtc/limbo,sentinelleader/limbo,serverdensity/sdbot,rizaon/limbo,kylemsguy/limbo,TetraEtc/limbo,llimllib/limbo,palachu/sdbot,michaelMinar/limbo,Marclass/limbo,llimllib/limbo,signalnine/alanabot,freshbooks/limbo,mmisiewicz/slask,ruhee/limbo