[whatwg/fetch] Use "reading a chunk" operation correctly (#571)

The operation takes a reader but we passed a stream. This change fixes that.

Fixes #570.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/571

-- Commit Summary --

  * initial
  * fix

-- File Changes --

    M fetch.bs (10)

-- Patch Links --

https://github.com/whatwg/fetch/pull/571.patch
https://github.com/whatwg/fetch/pull/571.diff

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