Fix PEP8 warnings.
Fix PEP8 warnings.

jimgoo/zipline-fork,dmitriz/zipline,grundgruen/zipline,enigmampc/catalyst,michaeljohnbennett/zipline,humdings/zipline,otmaneJai/Zipline,YuepengGuo/zipline,kmather73/zipline,Scapogo/zipline,semio/zipline,aajtodd/zipline,AlirezaShahabi/zipline,gwulfs/zipline,nborggren/zipline,florentchandelier/zipline,bartosh/zipline,chrjxj/zipline,ChinaQuants/zipline,ronalcc/zipline,dhruvparamhans/zipline,gwulfs/zipline,erikness/AlephOne,alphaBenj/zipline,wubr2000/zipline,stkubr/zipline,jordancheah/zipline,bartosh/zipline,florentchandelier/zipline,enigmampc/catalyst,joequant/zipline,DVegaCapital/zipline,dkushner/zipline,CDSFinance/zipline,DVegaCapital/zipline,morrisonwudi/zipline,davidastephens/zipline,aajtodd/zipline,jimgoo/zipline-fork,joequant/zipline,YuepengGuo/zipline,dmitriz/zipline,MonoCloud/zipline,dkushner/zipline,Scapogo/zipline,ronalcc/zipline,zhoulingjun/zipline,euri10/zipline,StratsOn/zipline,wubr2000/zipline,keir-rex/zipline,magne-max/zipline-ja,quantopian/zipline,magne-max/zipline-ja,humdings/zipline,cmorgan/zipline,ChinaQuants/zipline,nborggren/zipline,cmorgan/zipline,euri10/zipline,quantopian/zipline,semio/zipline,grundgruen/zipline,wilsonkichoi/zipline,AlirezaShahabi/zipline,michaeljohnbennett/zipline,chrjxj/zipline,alphaBenj/zipline,zhoulingjun/zipline,stkubr/zipline,sketchytechky/zipline,jordancheah/zipline,CDSFinance/zipline,otmaneJai/Zipline,dhruvparamhans/zipline,davidastephens/zipline,keir-rex/zipline,umuzungu/zipline,mattcaldwell/zipline,umuzungu/zipline,CarterBain/AlephNull,wilsonkichoi/zipline,morrisonwudi/zipline,StratsOn/zipline,iamkingmaker/zipline,erikness/AlephOne,kmather73/zipline,CarterBain/AlephNull,iamkingmaker/zipline,MonoCloud/zipline,mattcaldwell/zipline,sketchytechky/zipline