Add Carthage compatibility badge to the README
Add Carthage compatibility badge to the README

isghe/ReactiveCocoa,andersio/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,yizzuide/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,qq644531343/ReactiveCocoa,liufeigit/ReactiveCocoa,sujeking/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,Pingco/ReactiveCocoa,Ricowere/ReactiveCocoa,add715/ReactiveCocoa,walkingsmarts/ReactiveCocoa,stupidfive/ReactiveCocoa,Eveian/ReactiveCocoa,fanghao085/ReactiveCocoa,alvinvarghese/ReactiveCocoa,hbucius/ReactiveCocoa,DreamHill/ReactiveCocoa,hj3938/ReactiveCocoa,JohnJin007/ReactiveCocoa,Ray0218/ReactiveCocoa,paulyoung/ReactiveCocoa,hbucius/ReactiveCocoa,JohnJin007/ReactiveCocoa,ikesyo/ReactiveCocoa,jaylib/ReactiveCocoa,alvinvarghese/ReactiveCocoa,Khan/ReactiveCocoa,ericzhou2008/ReactiveCocoa,chieryw/ReactiveCocoa,Ricowere/ReactiveCocoa,isghe/ReactiveCocoa,KuPai32G/ReactiveCocoa,wpstarnice/ReactiveCocoa,200895045/ReactiveCocoa,zhukaixy/ReactiveCocoa,cogddo/ReactiveCocoa,jsslai/ReactiveCocoa,taylormoonxu/ReactiveCocoa,zhenlove/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,buildo/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,huiping192/ReactiveCocoa,zhigang1992/ReactiveCocoa,takeshineshiro/ReactiveCocoa,fhchina/ReactiveCocoa,zhiwen1024/ReactiveCocoa,cogddo/ReactiveCocoa,dskatz22/ReactiveCocoa,dskatz22/ReactiveCocoa,brasbug/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,BlessNeo/ReactiveCocoa,almassapargali/ReactiveCocoa,andersio/ReactiveCocoa,zzqiltw/ReactiveCocoa,libiao88/ReactiveCocoa,xumaolin/ReactiveCocoa,hj3938/ReactiveCocoa,jackywpy/ReactiveCocoa,bensonday/ReactiveCocoa,longv2go/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,fanghao085/ReactiveCocoa,Liquidsoul/ReactiveCocoa,calebd/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,jeelun/ReactiveCocoa,ceekayel/ReactiveCocoa,yonekawa/ReactiveCocoa,dullgrass/ReactiveCocoa,towik/ReactiveCocoa,SanChain/ReactiveCocoa,buildo/ReactiveCocoa,SanChain/ReactiveCocoa,BrooksWon/ReactiveCocoa,kaylio/ReactiveCocoa,victorlin/ReactiveCocoa,itschaitanya/ReactiveCocoa,leichunfeng/ReactiveCocoa,JackLian/ReactiveCocoa,ikesyo/ReactiveCocoa,liufeigit/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,beni55/ReactiveCocoa,AlanJN/ReactiveCocoa,cstars135/ReactiveCocoa,BlessNeo/ReactiveCocoa,AlanJN/ReactiveCocoa,pzw224/ReactiveCocoa,Ricowere/ReactiveCocoa,yizzuide/ReactiveCocoa,zhaoguohui/ReactiveCocoa,tzongw/ReactiveCocoa,icepy/ReactiveCocoa,mattpetters/ReactiveCocoa,monkeydbobo/ReactiveCocoa,FelixYin66/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,Ray0218/ReactiveCocoa,shaohung001/ReactiveCocoa,SanChain/ReactiveCocoa,ddc391565320/ReactiveCocoa,goodheart/ReactiveCocoa,terry408911/ReactiveCocoa,jrmiddle/ReactiveCocoa,Rupert-RR/ReactiveCocoa,natan/ReactiveCocoa,zzzworm/ReactiveCocoa,nickcheng/ReactiveCocoa,hj3938/ReactiveCocoa,sdhzwm/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,sujeking/ReactiveCocoa,hilllinux/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,smilypeda/ReactiveCocoa,brasbug/ReactiveCocoa,mtxs007/ReactiveCocoa,zzqiltw/ReactiveCocoa,zxq3220122/ReactiveCocoa,Ricowere/ReactiveCocoa,esttorhe/ReactiveCocoa,BrooksWon/ReactiveCocoa,loupman/ReactiveCocoa,CQXfly/ReactiveCocoa,Juraldinio/ReactiveCocoa,llb1119/test,OneSmallTree/ReactiveCocoa,chao95957/ReactiveCocoa,huiping192/ReactiveCocoa,leichunfeng/ReactiveCocoa,Khan/ReactiveCocoa,almassapargali/ReactiveCocoa,alvinvarghese/ReactiveCocoa,dullgrass/ReactiveCocoa,natestedman/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,pzw224/ReactiveCocoa,Rupert-RR/ReactiveCocoa,vincentiss/ReactiveCocoa,zzzworm/ReactiveCocoa,Pingco/ReactiveCocoa,lixar/ReactiveCocoa,goodheart/ReactiveCocoa,hilllinux/ReactiveCocoa,dachaoisme/ReactiveCocoa,richeterre/ReactiveCocoa,windgo/ReactiveCocoa,andersio/ReactiveCocoa,vincentiss/ReactiveCocoa,shaohung001/ReactiveCocoa,ioshger0125/ReactiveCocoa,Ray0218/ReactiveCocoa,jaylib/ReactiveCocoa,on99/ReactiveCocoa,sdhzwm/ReactiveCocoa,cnbin/ReactiveCocoa,Eveian/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,clg0118/ReactiveCocoa,ShawnLeee/ReactiveCocoa,zhigang1992/ReactiveCocoa,KuPai32G/ReactiveCocoa,zhaoguohui/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,xumaolin/ReactiveCocoa,stevielu/ReactiveCocoa,victorlin/ReactiveCocoa,KJin99/ReactiveCocoa,walkingsmarts/ReactiveCocoa,qq644531343/ReactiveCocoa,Ethan89/ReactiveCocoa,paulyoung/ReactiveCocoa,sandyway/ReactiveCocoa,fanghao085/ReactiveCocoa,tonyarnold/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,tornade0913/ReactiveCocoa,icepy/ReactiveCocoa,Pingco/ReactiveCocoa,zzqiltw/ReactiveCocoa,cstars135/ReactiveCocoa,kevin-zqw/ReactiveCocoa,qq644531343/ReactiveCocoa,zxq3220122/ReactiveCocoa,calebd/ReactiveCocoa,emodeqidao/ReactiveCocoa,stupidfive/ReactiveCocoa,imkerberos/ReactiveCocoa,ericzhou2008/ReactiveCocoa,beni55/ReactiveCocoa,dachaoisme/ReactiveCocoa,tornade0913/ReactiveCocoa,terry408911/ReactiveCocoa,jackywpy/ReactiveCocoa,leelili/ReactiveCocoa,tonyli508/ReactiveCocoa,natan/ReactiveCocoa,xiaobing2007/ReactiveCocoa,add715/ReactiveCocoa,icepy/ReactiveCocoa,ohwutup/ReactiveCocoa,imkerberos/ReactiveCocoa,xiaoliyang/ReactiveCocoa,200895045/ReactiveCo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