Update demo dependencies + Remove unused dependency 'prop-types'

Author: Oblosys

examples/parent-child-demo/package.json

@@ -11,10 +11,9 @@
     "react-scripts": "^4.0.3"
   },
   "dependencies": {
-    "prop-types": "^15.7.2",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "react-hot-loader": "^4.13.0",
-    "react-lifecycle-visualizer": "3.0.0"
+    "react-lifecycle-visualizer": "3.0.1"
   }
 }