Publish DD M17 v0.20.0

Thomas Gehrmann [InvitedE]requested to merge
57-publish-dd-m17-v0-20-0 into master

Publish OSDU Data Definition's milestone M17 snapshot.

This freezes the OSDU member GitLab schema repo at SHA 8dec155890db8676c755d08cbf594fcd0ca9b530.

Closes #57 (closed)

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