[w3c/editing] Readme schedule updates (#338)

* Proposed special 2-week meeting 

Closes #337 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/338

-- Commit Summary --

  * Update schedule
  * Drop TPAC schedule addition (in favor of 2nd PR)

-- File Changes --

    M README.md (5)

-- Patch Links --

https://github.com/w3c/editing/pull/338.patch
https://github.com/w3c/editing/pull/338.diff

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