Add an explicit subscription to parallelization example
Add an explicit subscription to parallelization example

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activeCocoa,yangyangluoluo/ReactiveCocoa,xumaolin/ReactiveCocoa,Pingco/ReactiveCocoa,jsslai/ReactiveCocoa,fanghao085/ReactiveCocoa,WEIBP/ReactiveCocoa,buildo/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,kaylio/ReactiveCocoa,OneSmallTree/ReactiveCocoa,nickcheng/ReactiveCocoa,dullgrass/ReactiveCocoa,ztchena/ReactiveCocoa,sujeking/ReactiveCocoa,zxq3220122/ReactiveCocoa,SuPair/ReactiveCocoa,tipbit/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,ailyanlu/ReactiveCocoa,qq644531343/ReactiveCocoa,ioshger0125/ReactiveCocoa,kevin-zqw/ReactiveCocoa,almassapargali/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,ohwutup/ReactiveCocoa,xulibao/ReactiveCocoa,ddc391565320/ReactiveCocoa,ceekayel/ReactiveCocoa,emodeqidao/ReactiveCocoa,add715/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,Juraldinio/ReactiveCocoa,monkeydbobo/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,sdhzwm/ReactiveCocoa,beni55/ReactiveCocoa,koamac/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,leichunfeng/ReactiveCocoa,cnbin/ReactiveCocoa,tornade0913/ReactiveCocoa,zzzworm/ReactiveCocoa,jianwoo/ReactiveCocoa,goodheart/ReactiveCocoa,bensonday/ReactiveCocoa,JackLian/ReactiveCocoa,tornade0913/ReactiveCocoa,BlessNeo/ReactiveCocoa,victorlin/ReactiveCocoa,nikita-leonov/ReactiveCocoa,hilllinux/ReactiveCocoa,isghe/ReactiveCocoa,nickcheng/ReactiveCocoa,natan/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,walkingsmarts/ReactiveCocoa,Rupert-RR/ReactiveCocoa,yoichitgy/ReactiveCocoa,jeelun/ReactiveCocoa,zzqiltw/ReactiveCocoa,ztchena/ReactiveCocoa,zhukaixy/ReactiveCocoa,tzongw/ReactiveCocoa,OneSmallTree/ReactiveCocoa,BrooksWon/ReactiveCocoa,ohwutup/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,dskatz22/ReactiveCocoa,zxq3220122/ReactiveCocoa,dullgrass/ReactiveCocoa,tornade0913/ReactiveCocoa,windgo/ReactiveCocoa,mxxiv/ReactiveCocoa,chao95957/ReactiveCocoa,zhenlove/ReactiveCocoa,vincentiss/ReactiveCocoa,kiurentu/ReactiveCocoa,ddc391565320/ReactiveCocoa,jam891/ReactiveCocoa,mattpetters/ReactiveCocoa,stevielu/ReactiveCocoa,gengjf/ReactiveCocoa,SanChain/ReactiveCocoa,qq644531343/ReactiveCocoa,yytong/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,brasbug/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,jianwoo/ReactiveCocoa,SuPair/ReactiveCocoa,richeterre/ReactiveCocoa,luerhouhou/ReactiveCocoa,dachaoisme/ReactiveCocoa,hj3938/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,takeshineshiro/ReactiveCocoa