chore(deps): update dependency mini-css-extract-plugin to v0.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	devDependencies	patch	0.8.0 -> 0.8.1

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Release Notes

webpack-contrib/mini-css-extract-plugin

### [`v0.8.1`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md#​081httpsgithubcomwebpack-contribmini-css-extract-plugincomparev080v081-2019-12-17) [Compare Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v0.8.0...v0.8.1)

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