Update dependency mini-css-extract-plugin to v0.10.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	devDependencies	minor	0.9.0 -> 0.10.0

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Release Notes

webpack-contrib/mini-css-extract-plugin

### [`v0.10.0`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md#​0100-httpsgithubcomwebpack-contribmini-css-extract-plugincomparev090v0100-2020-08-10) [Compare Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v0.9.0...v0.10.0)

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