Update Code of Conduct to v2.1

[seisman]

Description of proposed changes

Address #1739.

The original markdown text is available at https://www.contributor-covenant.org/version/2/1/code_of_conduct/code_of_conduct.md

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[weiji14]

Thanks @seisman!

Just want to double check though if @leouieda and @PaulWessel are still happy to be listed as contacts? Or we can nominate a new person (e.g. @meghanrjones) as an additional contact.

[PaulWessel]

I think for pyGMT it makes more sense to have @meghanrjones listed than me.

[maxrjones]

I can be listed. My SOEST directory page is https://www.soest.hawaii.edu/soestwp/about/directory/meghan-jones/ for people to find out how to get in touch.

[seisman]

I can be listed. My SOEST directory page is soest.hawaii.edu/soestwp/about/directory/meghan-jones for people to find out how to get in touch.

I just removed Paul and added Meghan to the list.

[leouieda]

I know this is merged to but just wanted to confirm that I'm happy to be listed there as a contact. 👍🏽