Bump eslint-loader from 2.1.2 to 2.2.1

Bumps [eslint-loader](https://github.com/webpack-contrib/eslint-loader) from 2.1.2 to 2.2.1.
- [Release notes](https://github.com/webpack-contrib/eslint-loader/releases)
- [Changelog](https://github.com/webpack-contrib/eslint-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/eslint-loader/compare/2.1.2...v2.2.1

)

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