[whatwg/url] Specify that domains are ASCII strings. (#409)

This is the only part of the URL Serializer's output that wasn't already
specified to be ASCII.

I believe domains are always ASCII because:
* The URL Parser always sets a URL's host to the result of the host
  parser.
* The host parser on things other than IPv4, IPv6, and opaque hosts
  (i.e. "domains") returns |asciiDomain|, the result of 'domain to
  ASCII'.
* The URL.host setter passes its input through the URL parser.


I care because the result of the URL Serializer is ASCII except maybe for the domain, and I want to know the right way to convert it to a [header's value](https://fetch.spec.whatwg.org/#concept-header-value), a byte sequence.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/409

-- Commit Summary --

  * Specify that domains are ASCII strings.

-- File Changes --

    M url.bs (12)

-- Patch Links --

https://github.com/whatwg/url/pull/409.patch
https://github.com/whatwg/url/pull/409.diff

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