[whatwg/streams] Meta: Fix CONTRIBUTING.md link (#880)

This fixes the CONTRIBUTING.md link, which seems broken due to case-sensitivity.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/880

-- Commit Summary --

  * Meta: Fix CONTRIBUTING.md link

-- File Changes --

    M README.md (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/880.patch
https://github.com/whatwg/streams/pull/880.diff

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