DOC: Fixing appveyor status badge
DOC: Fixing appveyor status badge

bartosh/zipline,alphaBenj/zipline,umuzungu/zipline,quantopian/zipline,florentchandelier/zipline,magne-max/zipline-ja,enigmampc/catalyst,enigmampc/catalyst,wilsonkichoi/zipline,humdings/zipline,Scapogo/zipline,Scapogo/zipline,magne-max/zipline-ja,bartosh/zipline,quantopian/zipline,wilsonkichoi/zipline,florentchandelier/zipline,umuzungu/zipline,humdings/zipline,alphaBenj/zipline