BLD: Update TA-Lib to latest version.
BLD: Update TA-Lib to latest version.

Keeping current with TA-Lib release.
Also, TA-Lib 0.4.7 has been removed from PyPI, so 0.4.8
is required for fresh PyPI based installs.

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