[w3c/editing] Update README.md (#274)

Updating google calendar invite link as we've received reports of it not working

Closes #????

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/274

-- Commit Summary --

  * Update README.md

-- File Changes --

    M README.md (5)

-- Patch Links --

https://github.com/w3c/editing/pull/274.patch
https://github.com/w3c/editing/pull/274.diff

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