Publish to pub.dartlag.org/packages

Steps to publish to pub.dartlang.org:

Remove MacOS Finder extended properties: sudo xattr -cr
Verify no documentation issues: dartdoc --no-auto-include-dependencies
Verify packages are all up to date: flutter pub outdated
Verify no code issues: flutter analyze
Run unit tests: flutter test
Do a dry run: flutter pub publish --dry-run
Publish: flutter pub publish
Verify at: https://pub.dev/packages/flutter_material_pickers
Apply tag to git: git tag v1.x.x then git push origin --tags