Correct license in read me

Author: sandeepmistry

README.adoc

@@ -13,9 +13,6 @@ http://www.arduino.cc/en/Reference/WiFiNINA
 
 Copyright (c) 2018 Arduino SA. All rights reserved.
 Copyright (c) 2011-2014 Arduino LLC. All right reserved.
-Copyright (C) 2006-2008, Atmel Corporation All rights reserved.
-Copyright (c) 2001-2004 Swedish Institute of Computer Science.
-Copyright (c) 2009-2010, H&D Wireless AB All rights reserved.
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public