chore(package): update mini-css-extract-plugin to version 0.7.0

Closes #17

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "html-webpack-plugin": "^3.2.0",
     "husky": "^1.0.0-rc.13",
     "json-loader": "^0.5.7",
-    "mini-css-extract-plugin": "^0.4.1",
+    "mini-css-extract-plugin": "^0.7.0",
     "postcss-loader": "^2.1.6",
     "sass-lint": "^1.12.1",
     "sass-loader": "^7.0.3",