Bump css-loader from 1.0.1 to 2.0.0 in /apps/updatenotification

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 1.0.1 to 2.0.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v1.0.1...v2.0.0

)

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