Development Notes

For every update, don't forget to add a note in CHANGELOG.md.
How to do a release:
- git checkout main
- Check if CHANGELOG.md is up to date.
- Update the version number in package.json.
- Update milestones example in /src/stories/assets/milestones.json.
- git commit -m "Bump version to <version-number>. ..."
- git tag <version-number>
- yarn build-storybook
- yarn deploy-storybook
- git push origin main
- git push --tags
- npm publish
- Add version changelog to GitHub release https://github.com/walterra/d3-milestones/tags