[whatwg/streams] Fix broken Bikeshed install link in CONTRIBUTING.md (#892)

Link to Bikeshed install instructions was invalid.
Link is now accurate and links to official Bikeshed install documentation
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/892

-- Commit Summary --

  * Fix broken Bikeshed install link in CONTRIBUTING.md

-- File Changes --

    M CONTRIBUTING.md (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/892.patch
https://github.com/whatwg/streams/pull/892.diff

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