[whatwg/streams] Mark pipeTo promise created by pipeThrough as handled (#664)

Closes #652. Will edit this post with a link to tests momentarily.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/664

-- Commit Summary --

  * Mark pipeTo promise created by pipeThrough as handled

-- File Changes --

    M index.bs (4)
    M reference-implementation/lib/readable-stream.js (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/664.patch
https://github.com/whatwg/streams/pull/664.diff

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