Bump eslint-webpack-plugin from 2.6.0 to 3.1.1

Bumps [eslint-webpack-plugin](https://github.com/webpack-contrib/eslint-webpack-plugin) from 2.6.0 to 3.1.1.
- [Release notes](https://github.com/webpack-contrib/eslint-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/eslint-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/eslint-webpack-plugin/compare/v2.6.0...v3.1.1

)

---
updated-dependencies:
- dependency-name: eslint-webpack-plugin
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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