Include original reference to 'gender' in COC

[varjmes]

To be extra explicit for the following reason:

'Gender' can be defined as the way society perceives your gender to be (often in a binary format). Whereas 'gender identity' may be referred to as your own sense of self/identity. As they can certainly both form the basis of harassment, I felt I should correct my mistake and put 'gender' back in much like the Contributor Covenant does.

Happy to discuss, and apologies for my original mistake.

[varjmes]

r? @steveklabnik

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

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[brson]

Let's discuss before making changes to the COC. cc @rust-lang/core.

[aturon]

Thanks for the contribution! We'll plan to talk about this change, and CoC changes in general, at the next core team meeting on Wednesday. See my other comment for a bit more detail.

[nikomatsakis]

I just opened a PR which synchronizes our list of personal characteristics with the one found in the contributor's convenant. This includes the change proposed here, along with a few other things. Therefore, I'm going to close this PR in favor of #288. Thanks @Charlotteis.