README: mention "Who Uses Quick" use submodules
README: mention "Who Uses Quick" use submodules

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