[whatwg/fetch] Fixed typo (#823)

Removed an unneeded comma on line 18
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/823

-- Commit Summary --

  * Removed an unneeded comma on line 18

-- File Changes --

    M README.md (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/823.patch
https://github.com/whatwg/fetch/pull/823.diff

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