chore(package): update css-loader to version 3.5.0

Closes #23

Author: greenkeeper[bot]

package.json

@@ -71,7 +71,7 @@
     "conventional-github-releaser": "2.0.2",
     "copy-webpack-plugin": "^5.0.3",
     "core-js": "^2.6.9",
-    "css-loader": "^2.1.0",
+    "css-loader": "^3.5.0",
     "cssnano": "^4.1.8",
     "del": "^3.0.0",
     "fancy-log": "^1.3.3",