Contributor Code of Conduct
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As we advocate for the Drupal community to be diverse and inclusive, we are
aware that as a working group, we must also work to be inclusive, respectful and
diverse. We’ve adopted the contributor code of conduct created by Contributor
Convenant.
http://contributor-covenant.org/version/1/4/

You can review the discussion that lead to this decision here:
drupaldiversity/administration#13