Update the list of personal characteristics to synchronize with the Contributor's Covenant v1.3

[nikomatsakis]

This PR updates the list of personal characteristics to synchronize with the Contributor's Covenant v1.3. This is not intended as a change to the actual meaning of the CoC, since all of these characteristics were intended to be implied by the original wording. However, making the list more explicit is clearer for readers overall, and the CC seems to have a reasonable list.

r? @rust-lang/core
cc @rust-lang/moderation

UPDATE: Tweaked wording of this PR proposal somewhat.

UPDATE from @aturon: For reference, here's the announcement we sent out to the community:

Dear fellow Rustaceans,

I wanted to post notice regarding a recent clarification to the Code of Conduct. In particular, the original CoC began with the following text:

We are committed to providing a friendly, safe and welcoming environment for all, regardless of gender identity and expression, sexual orientation, disability, ethnicity, religion, or similar personal characteristic.

We've updated this list of example characteristics to be more inclusive, per current best practices (more specifically, we are incorporating the list from the Contributor's Covenant v1.3.0):

We are committed to providing a friendly, safe and welcoming environment for all, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, religion, nationality, or other similar characteristic.

This is not intended as a change to the actual meaning of the CoC, since all of these characteristics were intended to be implied by the original wording. However, there is a benefit to being more explicit: it sends a clearer signal to members of specific underrepresented or frequently mistreated groups, to say that we hold them in mind, and intend to keep our spaces safe for them.

Thank you very much! You may now return to your regularly scheduled Rust discussions.

[Manishearth]

👍 from me

[steveklabnik]

👍

[alexcrichton]

Sounds good to me, thanks @nikomatsakis!

[aturon]

cc @Charlotteis

Strong 👍 for me. I like being more explicit, and especially the addition of "level of experience". I also think sync'ing with the current best practices here is a good way to go.

[brson]

Lgtm. Thanks @nikomatsakis

[niconii]

👍

[mbrubeck]

+1

[pnkfelix]

looks fine with me. (at first I thought "gender, gender ..." was a typo, but I can understand differentiating between "gender" and "gender identity/expression")

[huonw]

👍

[BurntSushi]

👍

[nikomatsakis]

OK, at this point everyone on the core team (and many on the mod team) have either commented here or spoken with me privately and approved this PR. Therefore, I am going to merge it. Thanks all!

[niconii]

🎉 🎊 🎉

[nikomatsakis]

Just FYI, I also announced this change on the users and internals boards.