[whatwg/url] Forbid | in URL hosts (#589)

This fixes issue #559.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/589


-- Commit Summary --

  * Forbit | in URL hosts

-- File Changes --

    M url.bs (2)

-- Patch Links --

https://github.com/whatwg/url/pull/589.patch

https://github.com/whatwg/url/pull/589.diff


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