[w3c/editing] Add reference to Selection API spec (#227)

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

  https://github.com/w3c/editing/pull/227

-- Commit Summary --

  * Add reference to Selection API spec

-- File Changes --

    M README.md (4)

-- Patch Links --

https://github.com/w3c/editing/pull/227.patch
https://github.com/w3c/editing/pull/227.diff

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