Copyright sign (C) is not required in LICENSE

According to https://opensource.org/licenses/ISC

LICENSE

@@ -1,7 +1,7 @@
 ISC License
 
-Copyright (C) 2016-2017 Aaron Marcher <me@drkhsh.at>
-Copyright (C) 2017 Laslo Hunhold <dev@frign.de>
+Copyright 2016-2017 Aaron Marcher <me@drkhsh.at>
+Copyright 2017 Laslo Hunhold <dev@frign.de>
 
 Permission to use, copy, modify, and/or distribute this software for any purpose
 with or without fee is hereby granted, provided that the above copyright notice