add pylint to test-requirements
add pylint to test-requirements

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