add .coverage to gitignore
add .coverage to gitignore

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