[w3c/selection-api] Use `group` field for respec, replacing `wg*` (#130)

This fixes the build error.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/130.html" title="Last updated on Dec 19, 2020, 10:40 AM UTC (6f76058)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/130/8a39318...6f76058.html" title="Last updated on Dec 19, 2020, 10:40 AM UTC (6f76058)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/130

-- Commit Summary --

  * Use `group` field for respec, replacing `wg*`

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/selection-api/pull/130.patch
https://github.com/w3c/selection-api/pull/130.diff

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