[w3c/editing] Update README.md (#319)

This updates the readme files to align it with the fact that this is now a working group.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/319

-- Commit Summary --

  * Update README.md

-- File Changes --

    M README.md (45)

-- Patch Links --

https://github.com/w3c/editing/pull/319.patch
https://github.com/w3c/editing/pull/319.diff

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Received on Thursday, 29 July 2021 20:44:12 UTC