Added warning about outdated version

index.html

@@ -183,12 +183,13 @@
                     <pre class="prettyprint">bower install vis</pre>
                     <h3>link from cdnjs.com</h3>
                     <p>
-                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.12.0/vis.min.js" target="_blank">vis.min.js</a><br>
-                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.12.0/vis.min.css" target="_blank">vis.min.css</a>
+                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.12.0/vis.min.js" target="_blank">vis.min.js</a> <br>
+                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.12.0/vis.min.css" target="_blank">vis.min.css</a> <br>
+                        (version 3.12.0, warning: this is an outdated version)
                     </p>
                     <h3>download</h3>
                     <p>
-                        <a href="download/vis.zip">vis.zip (version <span class="version">3.12.0</span>)</a>
+                        <a href="download/vis.zip">vis.zip (version <span class="version">4.1.0</span>)</a>
                     </p>
                 </div>
             </div>