[whatwg/fetch] Add response's cache mode back (#705)

Service workers needs it.

Fixes #376.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/705

-- Commit Summary --

  * Add response's cache mode back

-- File Changes --

    M fetch.bs (67)

-- Patch Links --

https://github.com/whatwg/fetch/pull/705.patch
https://github.com/whatwg/fetch/pull/705.diff

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