Fix supportedCWLversions to take into account `--enable-dev` flag
Fix supportedCWLversions to take into account `--enable-dev` flag

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