Bump eslint from 5.7.0 to 5.9.0 (#2329)

Bumps [eslint](https://github.com/eslint/eslint) from 5.7.0 to 5.9.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v5.7.0...v5.9.0

)

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