[w3c/ServiceWorker] Use proper license in CONTRIBUTING (#1135)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1135

-- Commit Summary --

  * Use proper license in CONTRIBUTING

-- File Changes --

    M CONTRIBUTING.md (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1135.patch
https://github.com/w3c/ServiceWorker/pull/1135.diff

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