Validating output from raml2html no longer passing

[iansk]

Validating the HTML output from the raml2html command used to pass:

$ raml2html -v twistlock_api.raml > twistlock_api.html

Now it fails, and no HTML output file is generated. Without the -v option, the HTML is generated. For now, generate the HTML without the -v option, but is worth investigating why this doesn't work anymore.