Bump clean-webpack-plugin from 3.0.0 to 4.0.0 (#286)

Bump clean-webpack-plugin from 3.0.0 to 4.0.0 (#286)

Bumps [clean-webpack-plugin](https://github.com/johnagan/clean-webpack-plugin) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/johnagan/clean-webpack-plugin/releases)
- [Commits](https://github.com/johnagan/clean-webpack-plugin/compare/v3.0.0...v4.0.0)

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

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