doc: Put current version on homepage

Author: isaacs

doc/index.html

@@ -23,6 +23,8 @@
         lightweight and efficient, perfect for data-intensive real-time
         applications that run across distributed devices.</p>
 
+        <p>Current Version: __VERSION__</p>
+
         <div class=buttons>
         <a href="http://nodejs.org/dist/__VERSION__/node-__VERSION__.tar.gz" class="button downloadbutton" id="downloadbutton">INSTALL</a>