chore(package): update css-loader to version 3.4.0

Closes #86

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "commitplease": "^3.2.0",
     "conventional-github-releaser": "2.0.2",
     "core-js": "^2.6.9",
-    "css-loader": "^2.1.0",
+    "css-loader": "^3.4.0",
     "cssnano": "^4.1.8",
     "del": "^3.0.0",
     "fancy-log": "^1.3.3",