Omit Referrer backwards compatibility
Omit Referrer backwards compatibility

Spec https://html.spec.whatwg.org/multipage/semantics.html#meta-referrer
Referrer-Policy header replaced with legacy meta "referrer" tag,
resource
https://github.com/GoogleChrome/lighthouse/issues/5709#issuecomment-416364623

laukstein/ajax-seo,laukstein/ajax-seo