Remove strict channel priority from Appveyor CI
Remove strict channel priority from Appveyor CI

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