Remove mention of Slack chat room
Remove mention of Slack chat room

It's not valuable for most users, being primarily used for conversations between collaborators.

See https://github.com/ReactiveCocoa/ReactiveCocoa/issues/871#issuecomment-66137012.
jsslai/ReactiveCocoa,FelixYin66/ReactiveCocoa,DreamHill/ReactiveCocoa,tonyarnold/ReactiveCocoa,buildo/ReactiveCocoa,tiger8888/ReactiveCocoa,rpowelll/ReactiveCocoa,KJin99/ReactiveCocoa,emodeqidao/ReactiveCocoa,beni55/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,dskatz22/ReactiveCocoa,jaylib/ReactiveCocoa,bensonday/ReactiveCocoa,vincentiss/ReactiveCocoa,Ricowere/ReactiveCocoa,wangqi211/ReactiveCocoa,walkingsmarts/ReactiveCocoa,nickcheng/ReactiveCocoa,Ray0218/ReactiveCocoa,libiao88/ReactiveCocoa,huiping192/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,shaohung001/ReactiveCocoa,calebd/ReactiveCocoa,ceekayel/ReactiveCocoa,OneSmallTree/ReactiveCocoa,ericzhou2008/ReactiveCocoa,ericzhou2008/ReactiveCocoa,kevin-zqw/ReactiveCocoa,towik/ReactiveCocoa,emodeqidao/ReactiveCocoa,zhenlove/ReactiveCocoa,koamac/ReactiveCocoa,natestedman/ReactiveCocoa,bencochran/ReactiveCocoa,Ethan89/ReactiveCocoa,sujeking/ReactiveCocoa,kaylio/ReactiveCocoa,Rupert-RR/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,KuPai32G/ReactiveCocoa,fhchina/ReactiveCocoa,shaohung001/ReactiveCocoa,Pikdays/ReactiveCocoa,chieryw/ReactiveCocoa,zhigang1992/ReactiveCocoa,ikesyo/ReactiveCocoa,KJin99/ReactiveCocoa,zhenlove/ReactiveCocoa,goodheart/ReactiveCocoa,luerhouhou/ReactiveCocoa,takeshineshiro/ReactiveCocoa,windgo/ReactiveCocoa,SuPair/ReactiveCocoa,ailyanlu/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,zzzworm/ReactiveCocoa,kevin-zqw/ReactiveCocoa,victorlin/ReactiveCocoa,gengjf/ReactiveCocoa,paulyoung/ReactiveCocoa,gengjf/ReactiveCocoa,smilypeda/ReactiveCocoa,icepy/ReactiveCocoa,j364960953/ReactiveCocoa,imkerberos/ReactiveCocoa,SanChain/ReactiveCocoa,Liquidsoul/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,taylormoonxu/ReactiveCocoa,add715/ReactiveCocoa,jam891/ReactiveCocoa,Eveian/ReactiveCocoa,ztchena/ReactiveCocoa,qq644531343/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,sandyway/ReactiveCocoa,zzqiltw/ReactiveCocoa,cstars135/ReactiveCocoa,monkeydbobo/ReactiveCocoa,BrooksWon/ReactiveCocoa,wpstarnice/ReactiveCocoa,Ricowere/ReactiveCocoa,zhenlove/ReactiveCocoa,tornade0913/ReactiveCocoa,Rupert-RR/ReactiveCocoa,stevielu/ReactiveCocoa,pzw224/ReactiveCocoa,buildo/ReactiveCocoa,howandhao/ReactiveCocoa,mxxiv/ReactiveCocoa,tonyli508/ReactiveCocoa,valleyman86/ReactiveCocoa,paulyoung/ReactiveCocoa,rpowelll/ReactiveCocoa,ceekayel/ReactiveCocoa,dachaoisme/ReactiveCocoa,bensonday/ReactiveCocoa,dachaoisme/ReactiveCocoa,longv2go/ReactiveCocoa,mxxiv/ReactiveCocoa,monkeydbobo/ReactiveCocoa,xulibao/ReactiveCocoa,stevielu/ReactiveCocoa,WEIBP/ReactiveCocoa,eliperkins/ReactiveCocoa,eliperkins/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,windgo/ReactiveCocoa,yoichitgy/ReactiveCocoa,stupidfive/ReactiveCocoa,terry408911/ReactiveCocoa,smilypeda/ReactiveCocoa,WEIBP/ReactiveCocoa,SanChain/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,rpowelll/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,wangqi211/ReactiveCocoa,llb1119/test,jianwoo/ReactiveCocoa,leelili/ReactiveCocoa,Khan/ReactiveCocoa,walkingsmarts/ReactiveCocoa,SuPair/ReactiveCocoa,itschaitanya/ReactiveCocoa,huiping192/ReactiveCocoa,natestedman/ReactiveCocoa,JackLian/ReactiveCocoa,vincentiss/ReactiveCocoa,libiao88/ReactiveCocoa,AlanJN/ReactiveCocoa,esttorhe/ReactiveCocoa,yonekawa/ReactiveCocoa,jsslai/ReactiveCocoa,kevin-zqw/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,zhaoguohui/ReactiveCocoa,Eveian/ReactiveCocoa,KuPai32G/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,yytong/ReactiveCocoa,alvinvarghese/ReactiveCocoa,BrooksWon/ReactiveCocoa,imkerberos/ReactiveCocoa,esttorhe/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,Carthage/ReactiveCocoa,leichunfeng/ReactiveCocoa,vincentiss/ReactiveCocoa,ohwutup/ReactiveCocoa,j364960953/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,CQXfly/ReactiveCocoa,victorlin/ReactiveCocoa,hoanganh6491/ReactiveCocoa,bscarano/ReactiveCocoa,CQXfly/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,zxq3220122/ReactiveCocoa,victorlin/ReactiveCocoa,koamac/ReactiveCocoa,ohwutup/ReactiveCocoa,JohnJin007/ReactiveCocoa,fanghao085/ReactiveCocoa,nikita-leonov/ReactiveCocoa,yonekawa/ReactiveCocoa,brasbug/ReactiveCocoa,zhiwen1024/ReactiveCocoa,liufeigit/ReactiveCocoa,esttorhe/ReactiveCocoa,tonyarnold/ReactiveCocoa,buildo/ReactiveCocoa,Eveian/ReactiveCocoa,icepy/ReactiveCocoa,emodeqidao/ReactiveCocoa,hilllinux/ReactiveCocoa,LHDsimon/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,OneSmallTree/ReactiveCocoa,Liquidsoul/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,libiao88/ReactiveCocoa,walkingsmarts/ReactiveCocoa,natan/ReactiveCocoa,bscarano/ReactiveCocoa,hj3938/ReactiveCocoa,335g/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,tonyli508/ReactiveCocoa,xiaoliyang/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,BlessNeo/ReactiveCocoa,tornade0913/ReactiveCocoa,goodheart/ReactiveCocoa,beni55/ReactiveCocoa,dachaoisme/ReactiveCocoa,pzw224/ReactiveCocoa,chieryw/ReactiveCocoa,FelixYin66/ReactiveCocoa,wpstarnice/ReactiveCocoa,BlessNeo/ReactiveCocoa,chao95957/ReactiveCocoa,nikita-leonov/ReactiveCocoa,jianwoo/ReactiveCocoa,pzw224/ReactiveCocoa,monkeydbobo/ReactiveCocoa,hoanganh6491/ReactiveCocoa,jeelun/ReactiveCocoa,zzqiltw/ReactiveCocoa,clg0118/ReactiveCocoa,ddc391565320/ReactiveCocoa,clg0118/ReactiveCocoa,loupman/ReactiveCocoa,Pikdays/ReactiveCocoa,valleyman86/ReactiveCocoa,clg0118/ReactiveCocoa,xiaoliyang/ReactiveCocoa,hbucius/ReactiveCocoa,jaylib/ReactiveCocoa,sandyway/ReactiveCocoa,ddc391565320/ReactiveCocoa,on99/ReactiveCocoa,cnbin/ReactiveCocoa,ailyanlu/ReactiveCocoa,hilllinux/ReactiveCocoa,jrmiddle/ReactiveCocoa,bencochran/ReactiveCocoa,leelili/ReactiveCocoa,almassapargali/ReactiveCocoa,kiurentu/ReactiveCocoa,AlanJN/ReactiveCocoa,icepy/ReactiveCocoa,zzzworm/ReactiveCocoa,eyu1988/ReactiveCocoa,tzongw/ReactiveCocoa,towik/ReactiveCocoa,fhchina/ReactiveCocoa,tiger8888/ReactiveCocoa,dz1111/ReactiveCocoa,jaylib/ReactiveCocoa,200895045/ReactiveCocoa,natestedman/ReactiveCocoa,andersio/ReactiveCocoa,goodheart/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,nikita-leonov/ReactiveCocoa,LHDsimon/ReactiveCocoa,jsslai/ReactiveCocoa,taylormoonxu/ReactiveCocoa,AlanJN/ReactiveCocoa,dullgrass/ReactiveCocoa,leelili/ReactiveCocoa,yoichitgy/ReactiveCocoa,terry408911/ReactiveCocoa,dz1111/ReactiveCocoa,Khan/ReactiveCocoa,imkerberos/ReactiveCocoa,taylormoonxu/ReactiveCocoa,kiurentu/ReactiveCocoa,jackywpy/ReactiveCocoa,chao95957/ReactiveCocoa,wangqi211/ReactiveCocoa,tornade0913/ReactiveCocoa,zxq3220122/ReactiveCocoa,JackLian/ReactiveCocoa,mattpetters/ReactiveCocoa,zhukaixy/ReactiveCocoa,calebd/ReactiveCocoa,nickcheng/ReactiveCocoa,brasbug/ReactiveCocoa,hbucius/ReactiveCocoa,BrooksWon/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,Pingco/ReactiveCocoa,ztchena/ReactiveCocoa,Farteen/ReactiveCocoa,windgo/ReactiveCocoa,nickcheng/ReactiveCocoa,terry408911/ReactiveCocoa,zhukaixy/ReactiveCocoa,alvinvarghese/ReactiveCocoa,cogddo/ReactiveCocoa,xumaolin/ReactiveCocoa,sugar2010/ReactiveCocoa,yizzuide/ReactiveCocoa,cnbin/ReactiveCocoa,howandhao/ReactiveCocoa,KJin99/ReactiveCocoa,Juraldinio/ReactiveCocoa,stupidfive/ReactiveCocoa,eliperkins/ReactiveCocoa,jeelun/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,Ethan89/ReactiveCocoa,fanghao085/ReactiveCocoa,sdhzwm/ReactiveCocoa,jianwoo/ReactiveCocoa,WEIBP/ReactiveCocoa,Juraldinio/ReactiveCocoa,hilllinux/ReactiveCocoa,dullgrass/ReactiveCocoa,jam891/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,xiaobing2007/ReactiveCocoa,richeterre/ReactiveCocoa,chieryw/ReactiveCocoa,ShawnLeee/ReactiveCocoa,towik/ReactiveCocoa,hoanganh6491/ReactiveCocoa,dskatz22/ReactiveCocoa,zhaoguohui/ReactiveCocoa,ailyanlu/ReactiveCocoa,ddc391565320/ReactiveCocoa,yizzuide/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,bencochran/ReactiveCocoa,liufeigit/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,Carthage/ReactiveCocoa,sugar2010/ReactiveCocoa,Juraldinio/ReactiveCocoa,jam891/ReactiveCocoa,cogddo/ReactiveCocoa,chao95957/ReactiveCocoa,brightcove/ReactiveCocoa,zzqiltw/ReactiveCocoa,Pingco/ReactiveCocoa,zhukaixy/ReactiveCocoa,brightcove/ReactiveCocoa,Farteen/ReactiveCocoa,SuPair/ReactiveCocoa,takeshineshiro/ReactiveCocoa,dullgrass/ReactiveCocoa,tonyli508/ReactiveCocoa,takeshineshiro/ReactiveCocoa,fhchina/ReactiveCocoa,ShawnLeee/ReactiveCocoa,lixar/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,ioshger0125/ReactiveCocoa,add715/ReactiveCocoa,LHDsimon/ReactiveCocoa,Carthage/ReactiveCocoa,paulyoung/ReactiveCocoa,sandyway/ReactiveCocoa,BlessNeo/ReactiveCocoa,yytong/ReactiveCocoa,yonekawa/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,howandhao/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,mattpetters/ReactiveCocoa,add715/ReactiveCocoa,ericzhou2008/ReactiveCocoa,hbucius/ReactiveCocoa,zhigang1992/ReactiveCocoa,almassapargali/ReactiveCocoa,natan/ReactiveCocoa,jackywpy/ReactiveCocoa,sdhzwm/ReactiveCocoa,leichunfeng/ReactiveCocoa,KuPai32G/ReactiveCocoa,esttorhe/ReactiveCocoa,Khan/ReactiveCocoa,loupman/ReactiveCocoa,kaylio/ReactiveCocoa,smilypeda/ReactiveCocoa,mtxs007/ReactiveCocoa,liufeigit/ReactiveCocoa,tzongw/ReactiveCocoa,xulibao/ReactiveCocoa,DreamHill/ReactiveCocoa,Pikdays/ReactiveCocoa,beni55/ReactiveCocoa,llb1119/test,leichunfeng/ReactiveCocoa,xiaoliyang/ReactiveCocoa,cstars135/ReactiveCocoa,Liquidsoul/ReactiveCocoa,almassapargali/ReactiveCocoa,cogddo/ReactiveCocoa,eyu1988/ReactiveCocoa,isghe/ReactiveCocoa,huiping192/ReactiveCocoa,jeelun/ReactiveCocoa,huiping192/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,Ethan89/ReactiveCocoa,CQXfly/ReactiveCocoa,Farteen/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,isghe/ReactiveCocoa,jrmiddle/ReactiveCocoa,dskatz22/ReactiveCocoa,zzzworm/ReactiveCocoa,qq644531343/ReactiveCocoa,Ricowere/ReactiveCocoa,yizzuide/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,Ricowere/ReactiveCocoa,shaohung001/ReactiveCocoa,xulibao/ReactiveCocoa,Ray0218/ReactiveCocoa,longv2go/ReactiveCocoa,SanChain/ReactiveCocoa,loupman/ReactiveCocoa,brightcove/ReactiveCocoa,cstars135/ReactiveCocoa,qq644531343/ReactiveCocoa,eyu1988/ReactiveCocoa,JackLian/ReactiveCocoa,zhaoguohui/ReactiveCocoa,FelixYin66/ReactiveCocoa,zhigang1992/ReactiveCocoa,zhiwen1024/ReactiveCocoa,stevielu/ReactiveCocoa,lixar/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,gengjf/ReactiveCocoa,JohnJin007/ReactiveCocoa,i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