Added note about updates

Author: Gian Perrone

index.html

@@ -25,6 +25,7 @@
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 <h1>Ur/Web Tutorial</h1>
 <h2>Gian Perrone - April 2011</h2>
+<p><em>Updated: 4 Jan 2013 - The way Ur/Web handled event handlers changed, and so some of the code samples in this tutorial were no longer correct.  This has been remedied.  Also, the way Github served static files changed sufficiently to break the CSS includes used in previous versions.  I have replaced these links with versions on this server that you can hotlink to run your examples.  You will need to use the latest version of Ur/Web.  Please let me know if you experience any difficulties.</em></p>
 <p>
 This is an introductory tutorial designed to get you started constructing applications in <a href="http://www.impredicative.com/ur">Ur/Web</a>, a modern, functional language for constructing web applications.  This tutorial takes the form of an example application, and a guide explaining the steps of construction.
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