Test Python 3.7 on Appveyor
Test Python 3.7 on Appveyor

willu47/smif,tomalrussell/smif,nismod/smif,tomalrussell/smif,willu47/smif,nismod/smif,tomalrussell/smif,willu47/smif,nismod/smif,nismod/smif,tomalrussell/smif,willu47/smif