Updates pytz package to latest. 2011n -> 2012h
Updates pytz package to latest. 2011n -> 2012h

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