Update example.html

Author: mac-s-g

example/example.html

@@ -20,7 +20,7 @@
   <div id="app-container"></div>
   <script src="https://unpkg.com/react@15/dist/react.js"></script>
   <script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script>
-  <script src="https://unpkg.com/react-json-view@latest/dist/main.js"></script>
+  <script src="https://unpkg.com/react-json-view@1.3.4/dist/main.js"></script>
   <script type="text/javascript">
       var test_json = {
         test: 'this is a test string',