travis: skip generating pypi documentation
travis: skip generating pypi documentation

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