Bump stylelint-webpack-plugin from 1.0.3 to 1.0.4

Bumps [stylelint-webpack-plugin](https://github.com/webpack-contrib/stylelint-webpack-plugin) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/webpack-contrib/stylelint-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/stylelint-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/stylelint-webpack-plugin/compare/v1.0.3...v1.0.4

)

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