[whatwg/url] Valid domain needs to account for ending with a number (PR #918)

However, making example.1 invalid also makes 1.2 invalid. Valid IPv4 does not allow for 1.2, so we also add IPv4-too-few-parts to address that.

Helps with #704.


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  https://github.com/whatwg/url/pull/918

-- Commit Summary --

  * Valid domain needs to account for ending with a number

-- File Changes --

    M url.bs (18)

-- Patch Links --

https://github.com/whatwg/url/pull/918.patch
https://github.com/whatwg/url/pull/918.diff

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