Bump file-loader from 3.0.1 to 4.0.0

Bumps [file-loader](https://github.com/webpack-contrib/file-loader) from 3.0.1 to 4.0.0.
- [Release notes](https://github.com/webpack-contrib/file-loader/releases)
- [Changelog](https://github.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/file-loader/compare/v3.0.1...v4.0.0

)

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