Use newer ruamel.yaml
Use newer ruamel.yaml

avoiding stdout printout
xxy values_iter
xxy values_iter
xxy values_iter
xxy values_iter
xxy values_iter

which obviously broke --print-rdf

common-workflow-language/cwlviewer,common-workflow-language/cwlviewer,common-workflow-language/cwlviewer,common-workflow-language/cwlviewer