Use DataSet in example 01

examples/network/01_basic_usage.html

@@ -24,13 +24,13 @@
 
 <script type="text/javascript">
   // create an array with nodes
-  var nodes = [
+  var nodes = new vis.DataSet([
     {id: 1, label: 'Node 1'},
     {id: 2, label: 'Node 2'},
     {id: 3, label: 'Node 3'},
     {id: 4, label: 'Node 4'},
     {id: 5, label: 'Node 5'}
-  ];
+  ]);
 
   // create an array with edges
   var edges = new vis.DataSet([