Update README to point to Slack channel instead of HipChat
Update README to point to Slack channel instead of HipChat

weevilgenius/codecombat,bsmr-x-script/codecombat,Zerrien/codecombat,duybkict/codecombat,UltCombo/codecombat,MonkStrom/codecombat,jeremiahyan/codecombat,kidaa/codecombat,probil/codecombat,probil/codecombat,jacobakkerboom/codecombat,Minhir/codecombat,jeremyprice/codecombat,laituan245/codecombat,khoa102/codecombat,jeremiahyan/codecombat,weevilgenius/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,jacobakkerboom/codecombat,codecombat/codecombat,Zerrien/codecombat,kidaa/codecombat,edtrist/codecombat,MonkStrom/codecombat,codecombat/codecombat,aashaka/codecombat,UltCombo/codecombat,jeremiahyan/codecombat,bsmr-x-script/codecombat,differentmatt/codecombat,jacobakkerboom/codecombat,tpai/codecombat,Minhir/codecombat,icodegame/codecombat,jeremyprice/codecombat,javatlacati/codecombat,differentmatt/codecombat,edtrist/codecombat,jeremyprice/codecombat,laituan245/codecombat,tpai/codecombat,laituan245/codecombat,jhoon/codecombat,VilkkuV/codecombat,Zacharias030/codecombat,laituan245/codecombat,bsmr-x-script/codecombat,Zacharias030/codecombat,wgsu/codecombat,nimda7/codecombat,edtrist/codecombat,tpai/codecombat,aashaka/codecombat,UltCombo/codecombat,Zacharias030/codecombat,khoa102/codecombat,zhangxiuquan/codecombat,VilkkuV/codecombat,MonkStrom/codecombat,jhoon/codecombat,zhangxiuquan/codecombat,javatlacati/codecombat,duybkict/codecombat,duybkict/codecombat,javatlacati/codecombat,khoa102/codecombat,Minhir/codecombat,Minhir/codecombat,zhangxiuquan/codecombat,khoa102/codecombat,jacobakkerboom/codecombat,aashaka/codecombat,icodegame/codecombat,aashaka/codecombat,edtrist/codecombat,differentmatt/codecombat,probil/codecombat,Zacharias030/codecombat,fabichoi/codecombat,jhoon/codecombat,MonkStrom/codecombat,javatlacati/codecombat,tpai/codecombat,VilkkuV/codecombat,duybkict/codecombat,fabichoi/codecombat,icodegame/codecombat,VilkkuV/codecombat,bsmr-x-script/codecombat,Zerrien/codecombat,probil/codecombat,jeremyprice/codecombat,jeremiahyan/codecombat,nimda7/codecombat,icodegame/codecombat,codecombat/codecombat,wgsu/codecombat,wgsu/codecombat,nimda7/codecombat,fabichoi/codecombat,wgsu/codecombat,weevilgenius/codecombat,jhoon/codecombat,zhangxiuquan/codecombat,kidaa/codecombat,UltCombo/codecombat,differentmatt/codecombat,weevilgenius/codecombat,Zerrien/codecombat,fabichoi/codecombat,kidaa/codecombat,nimda7/codecombat