BLD: Cancel previously queued appveyor builds for a PR
BLD: Cancel previously queued appveyor builds for a PR

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