[whatwg/fetch] Advise `Vary` even for non-CORS-request responses (#564)

See https://stackoverflow.com/a/45081016/441757
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/564

-- Commit Summary --

  * Advise `Vary` even for non-CORS-request responses

-- File Changes --

    M fetch.bs (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/564.patch
https://github.com/whatwg/fetch/pull/564.diff

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