[w3c/clipboard-apis] Update README.md (#157)

Update README.md because the group is now using GitHub Actions to build/validate/publish the spec.

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

  https://github.com/w3c/clipboard-apis/pull/157

-- Commit Summary --

  * Update README.md

-- File Changes --

    M README.md (2)

-- Patch Links --

https://github.com/w3c/clipboard-apis/pull/157.patch
https://github.com/w3c/clipboard-apis/pull/157.diff

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