fix(deps): update dependency mini-css-extract-plugin to v0.9.0 (#41)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -59,7 +59,7 @@
     "identity-obj-proxy": "3.0.0",
     "image-webpack-loader": "4.6.0",
     "jest": "24.9.0",
-    "mini-css-extract-plugin": "0.8.0",
+    "mini-css-extract-plugin": "0.9.0",
     "new-relic-source-map-webpack-plugin": "1.2.0",
     "node-sass": "4.13.1",
     "postcss-loader": "3.0.0",