Update copyright.

thunar/thunar-dialogs.c

 /* $Id$ */
 /*-
- * Copyright (c) 2005-2007 Benedikt Meurer <benny@xfce.org>
- * Copyright (c) 2009-2010 Jannis Pohlmann <jannis@xfce.org>
+ * Copyright (c) 2005-2011 Benedikt Meurer <benny@xfce.org>
+ * Copyright (c) 2009-2011 Jannis Pohlmann <jannis@xfce.org>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -238,9 +238,9 @@ thunar_dialogs_show_about (GtkWindow   *parent,
                          "artists", artists,
                          "authors", authors,
                          "comments", comments,
-                         "copyright", "Copyright \302\251 2004-2009 Benedikt Meurer\n"
-                                      "Copyright \302\251 2009-2010 Jannis Pohlmann\n"
-                                      "Copyright \302\251 2009-2010 Nick Schermer",
+                         "copyright", "Copyright \302\251 2004-2011 Benedikt Meurer\n"
+                                      "Copyright \302\251 2009-2011 Jannis Pohlmann\n"
+                                      "Copyright \302\251 2009-2011 Nick Schermer",
                          "destroy-with-parent", TRUE,
                          "documenters", documenters,
                          "license", XFCE_LICENSE_GPL,