Update dependency css-loader to v2.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
css-loader	devDependencies	patch	2.1.0 -> 2.1.1	source

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Release Notes

webpack-contrib/css-loader

### [`v2.1.1`](https://togithub.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md#​211httpsgithubcomwebpack-contribcss-loadercomparev210v211-2019-03-07) [Compare Source](https://togithub.com/webpack-contrib/css-loader/compare/v2.1.0...v2.1.1) ##### Bug Fixes - do not break selector with escaping ([#​896](https://togithub.com/webpack-contrib/css-loader/issues/896)) ([0ba8c66](https://togithub.com/webpack-contrib/css-loader/commit/0ba8c66)) - source map generation when `sourceRoot` is present ([#​901](https://togithub.com/webpack-contrib/css-loader/issues/901)) ([e9ce745](https://togithub.com/webpack-contrib/css-loader/commit/e9ce745)) - sourcemap generating when previous loader pass sourcemap as string ([#​905](https://togithub.com/webpack-contrib/css-loader/issues/905)) ([3797e4d](https://togithub.com/webpack-contrib/css-loader/commit/3797e4d))

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