Bump css-loader from 3.0.0 to 3.1.0 in /webui

[dependabot-preview[bot]]

Bumps css-loader from 3.0.0 to 3.1.0.

Release notes

*Sourced from [css-loader's releases](https://github.com/webpack-contrib/css-loader/releases).* > ## v3.1.0 > ## [3.1.0](https://github.com/webpack-contrib/css-loader/compare/v3.0.0...v3.1.0) (2019-07-18) > > > ### Bug Fixes > > * converting all (including reserved and control) filesystem characters to `-` (it was regression in `3.0.0` version) ([#972](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/972)) ([f51859b](https://github.com/webpack-contrib/css-loader/commit/f51859b)) > * default context should be undefined instead of null ([#965](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/965)) ([9c32885](https://github.com/webpack-contrib/css-loader/commit/9c32885)) > > > ### Features > > * allow `modules.getLocalIdent` to return a falsy value ([#963](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/963)) ([9c3571c](https://github.com/webpack-contrib/css-loader/commit/9c3571c)) > * improved validation error messages ([65e4fc0](https://github.com/webpack-contrib/css-loader/commit/65e4fc0))

Changelog

*Sourced from [css-loader's changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md).* > ## [3.1.0](https://github.com/webpack-contrib/css-loader/compare/v3.0.0...v3.1.0) (2019-07-18) > > > ### Bug Fixes > > * converting all (including reserved and control) filesystem characters to `-` (it was regression in `3.0.0` version) ([#972](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/972)) ([f51859b](https://github.com/webpack-contrib/css-loader/commit/f51859b)) > * default context should be undefined instead of null ([#965](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/965)) ([9c32885](https://github.com/webpack-contrib/css-loader/commit/9c32885)) > > > ### Features > > * allow `modules.getLocalIdent` to return a falsy value ([#963](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/963)) ([9c3571c](https://github.com/webpack-contrib/css-loader/commit/9c3571c)) > * improved validation error messages ([65e4fc0](https://github.com/webpack-contrib/css-loader/commit/65e4fc0))

Commits

- [`926ebbd`](https://github.com/webpack-contrib/css-loader/commit/926ebbd7922fb0044df1674a4c930bd1a95790d7) chore(release): 3.1.0 - [`5d2c52e`](https://github.com/webpack-contrib/css-loader/commit/5d2c52e812f37e8a81fe8a8a9b05475a1ee4aca1) test: escaped in selectors ([#973](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/973)) - [`f51859b`](https://github.com/webpack-contrib/css-loader/commit/f51859b41db6516662979b8bd852c530e1e2780f) fix: converting reserved and control filesystem characters to `-` ([#972](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/972)) - [`65e4fc0`](https://github.com/webpack-contrib/css-loader/commit/65e4fc0f1e2f85bcd91d2daeb19e64a2ced9ff1d) feat: improved validation error messages - [`9c32885`](https://github.com/webpack-contrib/css-loader/commit/9c328859a4d742cbabe615fd2aee27ed279e5675) fix: default context should be undefined instead of null ([#965](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/965)) - [`9c3571c`](https://github.com/webpack-contrib/css-loader/commit/9c3571ca9461b9c7deaaa347de38f57bbb1be11b) feat: allow `modules.getLocalIdent` to return a falsy value ([#963](https://github-redirect.dependabot.com/webpack-contrib/css-loader/issues/963)) - See full diff in [compare view](https://github.com/webpack-contrib/css-loader/compare/v3.0.0...v3.1.0)

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[dependabot-preview[bot]]

Superseded by #536.