There is no HSDir3 flag, but prop224 says there should be

I think we need to update this part of the proposal to say that a v3 HSDir has:

  • the HSDir flag, and
  • HSDir protocol version 2, and
  • a tor version >= 0.3.0.8.

https://gitweb.torproject.org/torspec.git/tree/proposals/224-rend-spec-ng.txt#n635

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