adding gui package to the html

guiEditor/public/index.html

@@ -11,6 +11,7 @@
     <link rel="stylesheet" href="https://use.typekit.net/cta4xsb.css"></link>
     <script src="https://preview.babylonjs.com/babylon.js"></script>
     <script src="https://preview.babylonjs.com/loaders/babylonjs.loaders.min.js"></script>
+    <script src="https://preview.babylonjs.com/gui/babylon.gui.min.js"></script>
     <script src="https://preview.babylonjs.com/guiEditor/babylon.guiEditor.js"></script>    
     
     <style>