[whatwg/url] Add official IANA assigned FTPS (FTP over TLS) port (#401)

**FTPS (FTP over TLS)** was specified in [RFC 4217](https://tools.ietf.org/html/rfc4217) by IETF, and officially assigned the ports `990` (command/​control) and `989` (data) by IANA soon after.

Because of the TLS everything process that is going on among browser vendors, I feel like adding FTPS to the URL specification is a good addition.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/401

-- Commit Summary --

  * Add official IANA assigned FTPS (FTP over TLS) port

-- File Changes --

    M url.bs (2)

-- Patch Links --

https://github.com/whatwg/url/pull/401.patch
https://github.com/whatwg/url/pull/401.diff

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