Add 2.4 Changelog

[jakirkham]

Includes some other Changelog entries for 2.4.

xref: #529

cc @jrbourbeau

TODO:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/tutorial.rst
• Changes documented in docs/release.rst
• AppVeyor and Travis CI passes
• Test coverage is 100% (Coveralls passes)

[jakirkham]

@potter420, are you ok being listed here? How would you like to be referred to?

[potter420]

I would like to be referred to as Tommy Tran.
My current name is kinda goofy.

[jakirkham]

Sounds good. Thanks. Have pushed in the latest commit. Can you please let me know whether I got that correct?

[jakirkham]

@jrbourbeau, could you please take a look and let me know if I'm missing anything?

[jrbourbeau]

Thanks @jakirkham, apologies for not getting to this earlier. I'm stepping away from my laptop for a few hours, but will review later this evening

[jrbourbeau]

Thanks for handling this @jakirkham! I added "Enhancements", "Documentation", and "Maintenance" sections in line with previous release notes and changelog entries for a few PRs (mostly small documentation updates).

I think the only remaining things are to update Upcoming Release to 2.4.0 and add a .. _release_2.4.0: marker

[jakirkham]

Thanks for doing that @jrbourbeau! Looks good. Added those missing pieces and merged with master. Please let me know if anything else is needed 🙂

[jrbourbeau]

I'll go through the release procedure docs and see if there are any updates to be made there. Other than that, we should be good to release (woo!)

[jrbourbeau]

I think we're good to merge this and push to PyPI

[jakirkham]

Push away! 😄