[whatwg/streams] Add fetch-progress examples to demos page (#893)

Adds link to the "fetch-progress" repository, which provides examples for showing progress indicators with Streams, Fetch, and Service Workers
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/893

-- Commit Summary --

  * Add fetch-progress examples to demos page

-- File Changes --

    M demos/index.html (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/893.patch
https://github.com/whatwg/streams/pull/893.diff

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