update license

LICENSE

 
-PotreeConverter 
+======================================================================================
+= PotreeConverter 
+======================================================================================
 http://potree.org
 
-Copyright (c) 2011-2014, Markus Schütz
+Copyright (c) 2011-2020, Markus Schütz
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -29,3 +31,40 @@ The views and conclusions contained in the software and documentation are those
 of the authors and should not be interpreted as representing official policies,
 either expressed or implied, of the FreeBSD Project.
 
+
+======================================================================================
+= LASZIP
+======================================================================================
+
+  LICENSE AGREEMENT (for LASzip LiDAR compression):
+
+  LASzip is open-source and is licensed with the standard LGPL version 2.1
+  (see COPYING.txt) modified by the following static linking exception.
+
+  As a special exception, the copyright holders of this library give you
+  permission to link this library with independent modules to produce an
+  executable, regardless of the license terms of these independent modules,
+  and to copy and distribute the resulting executable under terms of your
+  choice, provided that you also meet, for each linked independent module,
+  the terms and conditions of the license of that module. An independent
+  module is a module which is not derived from or based on this library.
+  If you modify this library, you may extend this exception to your version
+  of the library, but you are not obliged to do so. If you do not wish to
+  do so, delete this exception statement from your version.
+
+  This software is distributed WITHOUT ANY WARRANTY and without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+--------------------------------------------------------------------------
+
+  PROGRAMMERS:
+  
+  martin@rapidlasso.com
+  
+--------------------------------------------------------------------------
+
+  COPYRIGHT:
+  
+  (c) 2007-2015, martin isenburg, rapidlasso - fast tools to catch reality
+
+--------------------------------------------------------------------------
\ No newline at end of file