BLD: Downgrade Cython
BLD: Downgrade Cython

because of mislabeled osx anaconda package

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