adds an optional filter to the algorithm's date_sorted_sources
adds an optional filter to the algorithm's date_sorted_sources

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