update referenced jsmind version

Author: hizzgdev

example/3_requirejs.html

@@ -7,7 +7,7 @@
         <link
             type="text/css"
             rel="stylesheet"
-            href="https://unpkg.com/jsmind@0.8.7/style/jsmind.css"
+            href="https://unpkg.com/jsmind@0.8.8/style/jsmind.css"
         />
         <style type="text/css">
             #jsmind_container {
@@ -29,16 +29,16 @@
     <script type="text/javascript">
         require.config({
             paths: {
-                'jsmind': 'https://unpkg.com/jsmind@0.8.7/es6/jsmind',
-                'jsmind/draggable-node': 'https://unpkg.com/jsmind@0.8.7/es6/jsmind.draggable-node',
+                'jsmind': 'https://unpkg.com/jsmind@0.8.8/es6/jsmind',
+                'jsmind/draggable-node': 'https://unpkg.com/jsmind@0.8.8/es6/jsmind.draggable-node',
             },
         });
         require(['jsmind', 'jsmind/draggable-node'], function (jsMind, _) {
             let mind = {
                 meta: {
                     name: 'jsMind example',
                     author: 'hizzgdev@163.com',
-                    version: '0.8.7',
+                    version: '0.8.8',
                 },
                 format: 'node_tree',
                 data: {