Release steps

1. Ensure main branch passes CI tests
2. Bump version, create tags, push, and release:

• $ npm run <release:major|release:minor|release:patch>
• major - breaking API changes
• minor - backwards-compatible features
• patch - backwards-compatible bug fixes

3. Update CHANGELOG.md

• $ npm run changelog
• Manually verify that the changelog makes sense
• $ git push

4. Update https://github.com/shelljs/shelljs/releases to create a new release from the latest git tag