[minor patch] Amend CoC

[Taylan Kammer]

This is a really tiny thing.  A recent thread on the ML prompted me to
look at our CoC and I noticed it doesn't include 'sex' in the list of
things based on which one might be discriminated against, so attached
is a patch that adds that one word.

Note: The upstream Contributor Covenant wouldn't want to include it
because the author seems to have a peculiar world-view where they don't
acknowledge that humans actually have a sex.  I hope the Guix maintainers
are more reasonable than that. :-)

-- 
Taylan

0001-CODE-OF-CONDUCT-Add-sex-to-protected-characteristics.patch
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