Update changelog on master (from v0.40.x branch)

[clevinson]

Description

Pulls in updated & cleaned-up changelog from v0.40.x branch into master.

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• Targeted PR against correct branch (see CONTRIBUTING.md)
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• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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[alexanderbez]

Why do this now and not when we officially release v0.40.0?

[clevinson]

I think this would be useful to have rc-level changelog sections for more granular visibility of what subsequent bugfixes / additions get made in each release candidate.

This is me following the process that I saw tendermint using for their v0.34 release process.

My intention would be to squash the rc CHANGELOG sections into a single section for v0.40.0 once we publish the release. In the meantime, this is just meant to add better readability for folks tracking the RC process, who likely want to know which bugfixes make it into each RC.

[fedekunze]

should this be included on v0.40?

[amaury1093]

Yeah, that's a bug fix that would be good to put into 0.40. I added a backport label to it, it'll be included in the next round of backports.

[alexanderbez]

My intention would be to squash the rc CHANGELOG sections into a single section for v0.40.0 once we publish the release. In the meantime, this is just meant to add better readability for folks tracking the RC process, who likely want to know which bugfixes make it into each RC.

Sure, as long as you tidy it once the release is made I think that's fine 👍