chore(package): update css-loader to version 3.3.1

Closes #72

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "commitplease": "3.2.0",
     "conventional-github-releaser": "^3.1.2",
     "core-js": "2.6.5",
-    "css-loader": "2.1.1",
+    "css-loader": "3.3.1",
     "cssnano": "4.1.10",
     "del": "4.0.0",
     "fancy-log": "1.3.3",