Update package.json

Author: kyle-ds

example/web/react/package.json

@@ -9,7 +9,7 @@
     "dynamsoft-javascript-barcode": "7.3.0-v2",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
-    "react-scripts": "^3.3.0"
+    "react-scripts": "^3.4.0"
   },
   "scripts": {
     "start": "react-scripts start",