README: remove vestigial qck_ prefix
README: remove vestigial qck_ prefix

`qck_` prefix was mostly removed in a7332628, this finishes the job.

mrackwitz/Quick,jeffh/Quick,jeffh/Quick,jeffh/Quick,DanielAsher/Quick,ashfurrow/Quick,Quick/Quick,pengleelove/Quick,pcantrell/Quick,pedrovereza/Quick,ichu501/Quick,zhakui/Quick,cerberillo/Quick,phatblat/Quick,phatblat/Quick,pcantrell/Quick,hwsyy/Quick,github/Quick,mrackwitz/Quick,paulyoung/Quick,DrewKiino/Quick,jahilliard/Quick,modocache/personal-fork-of-Quick,ArthurKK/Quick,jasonchaffee/Quick,ikesyo/Quick,marciok/Quick,modocache/personal-fork-of-Quick,ikesyo/Quick,hwsyy/Quick,ikesyo/Quick,ArthurKK/Quick,msdgwzhy6/Quick,BlessNeo/Quick,jahilliard/Quick,jessesquires/Quick,marciok/Quick,luzefeng/Quick,orta/Quick,phatblat/Quick,Quick/Quick,mokagio/Quick,ashfurrow/Quick,jondwillis/Quick,mokagio/Quick,orta/Quick,mokagio/Quick,NatashaTheRobot/Quick,BlessNeo/Quick,github/Quick,jessesquires/Quick,paulyoung/Quick,dcaunt/Quick,nchatharoo/Quick,pedrovereza/Quick,jasonchaffee/Quick,fullstackclub/Quick,Quick/Quick,paulyoung/Quick,msdgwzhy6/Quick,dgdosen/Quick,dgdosen/Quick,ichu501/Quick,cerberillo/Quick,Sweefties/Quick,dcaunt/Quick,romankl/Quick,hanangellove/Quick,jasonchaffee/Quick,dgdosen/Quick,nchatharoo/Quick,DrewKiino/Quick,phatblat/Quick,hanangellove/Quick,Quick/Quick,wjszf/Quick,pengleelove/Quick,jondwillis/Quick,luzefeng/Quick,wjszf/Quick,Sweefties/Quick,zhakui/Quick,fullstackclub/Quick,marciok/Quick,DanielAsher/Quick,NatashaTheRobot/Quick,romankl/Quick