fix: upgrade react-scripts from 3.4.0 to 3.4.1 (#943)

Snyk has created this PR to upgrade react-scripts from 3.4.0 to 3.4.1.

See this package in NPM:
https://www.npmjs.com/package/react-scripts

See this project in Snyk:
https://app.snyk.io/org/josdejong/project/913c7924-24ae-4f86-8a9b-91da27c3e8f1?utm_source=github&utm_medium=upgrade-pr

examples/react_demo/package.json

@@ -6,7 +6,7 @@
     "jsoneditor": "^8.5.3",
     "react": "16.13.1",
     "react-dom": "16.13.1",
-    "react-scripts": "3.4.0"
+    "react-scripts": "3.4.1"
   },
   "scripts": {
     "start": "react-scripts start",