Removes unused random source method.
Removes unused random source method.

Method was unused and used an unimported module.

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