Bumps [commander](https://github.com/tj/commander.js) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tj/commander.js/compare/v6.2.0...v6.2.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>