Bump commander from 4.1.0 to 4.1.1 (#166)

Bumps [commander](https://github.com/tj/commander.js) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](tj/commander.js@v4.1.0...v4.1.1)

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