Update copyright year in about page (#5269)

skins/classic/templates/about.html

@@ -20,7 +20,7 @@
 <div id="license">
 <roundcube:object name="aboutcontent" />
 <h2 class="sysname">Roundcube Webmail <roundcube:object name="version" /></h2>
-<p class="copyright">Copyright &copy; 2005-2015, The Roundcube Dev Team</p>
+<p class="copyright">Copyright &copy; 2005-2016, The Roundcube Dev Team</p>
 <p class="license">This program is free software; you can redistribute it and/or modify
 it under the terms of the <a href="http://www.gnu.org/licenses/gpl.html" target="_blank">GNU General Public License</a>
 as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.<br/>

skins/larry/templates/about.html

@@ -14,7 +14,7 @@
 <roundcube:object name="aboutcontent" />
 
 <h2 class="sysname">Roundcube Webmail <roundcube:object name="version" /></h2>
-<p class="copyright">Copyright &copy; 2005-2015, The Roundcube Dev Team</p>
+<p class="copyright">Copyright &copy; 2005-2016, The Roundcube Dev Team</p>
 <p class="license">This program is free software; you can redistribute it and/or modify
 it under the terms of the <a href="http://www.gnu.org/licenses/gpl.html" target="_blank">GNU General Public License</a>
 as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.<br/>