version 0.4.0; update CHANGELOG.md

[dholth]

Description

0.4.x series.

Checklist - did you ...

• Add a file to the news directory (using the template) for the next release's release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[kenodegard]

@dholth is the plan to include #131 in conda-index 0.4.0?

if not we will need to undo the conda index subcommand removal in conda-build

[mbargull]

Do we plan to have a conda-index script available or just have conda index/python -m conda_index as entry points?
(I don't have a strong opinion on this, just asking. Depending on if yes/no this just determines if we want to conda-build<24.1 versions to use this or not (would need constraints to avoid clobbering bin/conda-index).)

[kenodegard]

Personally I'd prefer to not add it back as an entrypoint at this time, not against adding it back once/if there's a compelling argument

[mbargull]

Thanks. Yeah, would make things easier if we don't include it.
Just wanted to make sure everyone is on board :).

[jezdez]

What Ken said, I don't think we should add conda-index back and use the other official APIs.