fix: upgrade style-loader from 0.18.2 to 0.23.1

Snyk has created this PR to upgrade style-loader from 0.18.2 to 0.23.1.

See this package in NPM:
https://www.npmjs.com/package/style-loader

See this project in Snyk:
https://app.snyk.io/org/davidkindler/project/6865432e-9ae7-40aa-ab6d-807d59d4dccc?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -44,7 +44,7 @@
     "redux": "^3.7.2",
     "redux-saga": "^0.16.0",
     "redux-thunk": "^2.2.0",
-    "style-loader": "0.18.2",
+    "style-loader": "0.23.1",
     "sw-precache-webpack-plugin": "0.11.4",
     "url-loader": "0.5.9",
     "webpack": "4.0.0",