Update dependency mini-css-extract-plugin to ^0.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mini-css-extract-plugin	dependencies	minor	^0.7.0 -> ^0.8.0

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Release Notes

webpack-contrib/mini-css-extract-plugin

### [`v0.8.0`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md#​080httpsgithubcomwebpack-contribmini-css-extract-plugincomparev070v080-2019-07-16) [Compare Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v0.7.0...v0.8.0) ##### Features - Add ignoreOrder option ([#​422](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/422)) ([4ad3373](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/4ad3373))

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