Add 0.4.0 release notes

[mattwthompson]

Description

Provide a brief description of the PR's purpose here.

Todos

Notable points that this PR has either accomplished or will accomplish.

• [ ] TODO 1

Questions

• [ ] Question1

Status

• [ ] Ready to go

[codecov[bot]]

Codecov Report

Merging #208 (f218c9a) into main (a0f1753) will not change coverage. The diff coverage is n/a.

Additional details and impacted files