chore(package): update css-loader to version 3.3.2

Closes #13

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^8.2.6",
-    "css-loader": "^1.0.0",
+    "css-loader": "^3.3.2",
     "cssnano": "^4.0.4",
     "eslint": "^5.2.0",
     "eslint-config-prettier": "^2.9.0",