aspell --help: update copyright

prog/aspell.cpp

@@ -1,8 +1,8 @@
 // This file is part of The New Aspell Copyright (C)
-// 2002,2003,2004,2011,2019 by Kevin Atkinson under the GNU LGPL license
-// version 2.0 or 2.1.  You should have received a copy of the LGPL
-// license along with this library if you did not you can find it at
-// http://www.gnu.org/.
+// 2002,2003,2004,2011,2019,2023 by Kevin Atkinson
+// under the GNU LGPL license version 2.0 or 2.1.  You should have received a
+// copy of the LGPL license along with this library if you did not you can
+// find it at http://www.gnu.org/.
 
 //
 // NOTE: This program currently uses a very ugly mix of the internal
@@ -2882,7 +2882,7 @@ void print_help (bool verbose) {
   load_all_filters(options);
   if (verbose) {
     printf(_("\n"
-             "Aspell %s.  Copyright 2000-2019 by Kevin Atkinson.\n"
+             "Aspell %s.  Copyright 2000-2023 by Kevin Atkinson.\n"
              "\n"), aspell_version_string());
     for (unsigned i = 0; i < help_text_size; ++i)
       puts(gt_(help_text[i]));