Bump mini-css-extract-plugin from 1.4.1 to 1.5.0 (#590)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.4.1 to 1.5.0.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/mini-css-extract-plugin@v1.4.1...v1.5.0)

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Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
     "cross-env": "7.0.3",
     "css-loader": "5.2.1",
     "fibers": "5.0.0",
-    "mini-css-extract-plugin": "1.4.1",
+    "mini-css-extract-plugin": "1.5.0",
     "postcss": "8.2.10",
     "postcss-loader": "5.2.0",
     "sass": "1.32.10",