Update Keyboard.cpp

Author: PJ789

src/Keyboard.cpp

@@ -4,6 +4,7 @@
   Copyright (c) 2015, Arduino LLC
 
   Original code (pre-library): Copyright (c) 2011, Peter Barrett
+
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either