Fixes: [rel=noreferrer] is not added when element has no existing [rel] #3
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When an element has no pre-existing
[rel](e.g.<a href="#">Example</a>), theconfig.noreferrervalue is not respected. Even whenconfig.noreferrer: true, the output HTML still does not include[rel=noreferrer].This PR fixes that, so that
config.noreferreris respected regardless of what the pre-existing[rel]values are.