Fixes typo in nosetests invocation in Travis config.
Fixes typo in nosetests invocation in Travis config.

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