chore(demo): upgrade to v3.0.0

Author: bkrem

demo/package-lock.json

@@ -10,7 +10,7 @@
     "clone": "^2.1.2",
     "gh-pages": "^3.1.0",
     "react": "^17.0.1",
-    "react-d3-tree": "^2.0.4",
+    "react-d3-tree": "^3.0.0",
     "react-dom": "^17.0.1",
     "react-scripts": "^3.4.4"
   },