issue: Installer Footer Copyright

This addresses issue 4339 where the installer footer references the wrong
copyright date.

setup/inc/footer.inc.php

@@ -2,7 +2,7 @@
             <div class="clear"></div>
         </div> <!-- content -->
     </div> <!-- wizard -->
-    <div id="footer" class="centered">Copyright &copy; 2013 <a target="_blank" href="http://osticket.com">osTicket.com</a></div>
+    <div id="footer" class="centered">Copyright &copy; <?php echo date('Y'); ?> <a target="_blank" href="http://osticket.com">osTicket.com</a></div>
 
     <script type="text/javascript" src="../js/jquery-1.11.2.min.js"></script>
     <script type="text/javascript" src="../js/jstz.min.js"></script>