[whatwg/url] Semi-colon (;) should be illegal in URL hostname parsing (#159)

AFAICT Safari and Chrome already fail to parse this, both when trying to click links to e.g. "http://www.;.com/" and when trying to use the `URL` constructor to create that URL.

Edge and Firefox both seem to think it's valid. IE shows an error page but it's not clear to me what it thinks, and it doesn't seem to implement the `URL` constructor.

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