Update v0.8.8

demo.html

@@ -907,7 +907,7 @@
       </style>
     </div>
 
-    <script src="js/grapes.min.js?v0.8.4"></script>
+    <script src="js/grapes.min.js?v0.8.8"></script>
     <script src="js/grapesjs-plugin-export.min.js"></script>
     <script src="js/grapesjs-plugin-filestack.min.js"></script>
     <script src="js/grapesjs-aviary.min.js"></script>

js/grapesjs-preset-webpage.js

@@ -1,4 +1,4 @@
-grapesjs.plugins.add('gjs-preset-webpage', (editor, opts) => {
+grapesjs.plugins.add('gjs-preset-webpage', function(editor, opts) {
   var opt = opts || {};
   var config = editor.getConfig();
   var pfx = editor.getConfig().stylePrefix;
@@ -17,7 +17,7 @@ grapesjs.plugins.add('gjs-preset-webpage', (editor, opts) => {
   /****************** IMPORTER *************************/
 
   var codeViewer = editor.CodeManager.getViewer('CodeMirror').clone();
-  let container = document.createElement('div');
+  var container = document.createElement('div');
   var btnImp = document.createElement('button');
 
   // Init import button