Release: 0.4.0

[github-actions]

• Branch: Starting from develop, cut a release branch named release/0.4.0 for your changes.
• Version bump: Bump the version number in package.json and package-lock.json if it does not already reflect the version being released.
• Changelog: Add/update the changelog in CHANGELOG.md.
• Props: Update CREDITS.md file with any new contributors, confirm maintainers are accurate.
• Readme updates: Make any other readme changes as necessary in README.md.
• Merge: Make a non-fast-forward merge from your release branch to develop (or merge the Pull Request), then merge develop into trunk (git checkout develop && git pull origin develop && git checkout trunk && git pull origin trunk && git merge --no-ff develop). trunk contains the stable development version.
• Push: Push your trunk branch to GitHub (e.g. git push origin trunk).
• Release: Create a new release, naming the tag and the release with the new version number, and targeting the trunk branch. Paste the changelog from CHANGELOG.md into the body of the release and include a link to the closed issues on the milestone. The release should now appear under releases.
• Close milestone: Edit the milestone with release date (in the Due date (optional) field) and link to GitHub release (in the Description field), then close the milestone.
• Punt incomplete items: If any open issues or PRs which were milestoned for 0.4.0 do not make it into the release, update their milestone to 0.5.0 or Future Release.