Relax version dependency on python-six to 1.8.0 (#365)
Relax version dependency on python-six to 1.8.0 (#365)


SciDAP/cwltool,chapmanb/cwltool,dleehr/cwltool,dleehr/cwltool,chapmanb/cwltool,chapmanb/cwltool,common-workflow-language/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,dleehr/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,chapmanb/cwltool,dleehr/cwltool,SciDAP/cwltool