Bump eslint from 5.7.0 to 5.8.0 (#3030)

Bumps [eslint](https://github.com/eslint/eslint) from 5.7.0 to 5.8.0.
- [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...v5.8.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>