update pg versions

Playground/js/config_versions.js

@@ -2,5 +2,5 @@ CONFIG_last_versions = [
     ["Latest","https://preview.babylonjs.com/babylon.js"],
     ["4.0.3","https://unpkg.com/babylonjs@4.0.3/babylon.js"],
     ["4.0.0","https://unpkg.com/babylonjs@4.0.0/babylon.js"],
-    ["3.0","https://unpkg.com/babylonjs@3.0.7/dist/preview%20release/babylon.js"]
+    ["3.3","https://unpkg.com/babylonjs@3.3.0/babylon.js"]
 ];