change date in LICENSE

jhillairet · jhillairet · commit 2e5cc4f2e3be · 2020-07-26T09:45:28.000+02:00
diff --git a/LICENSE.txt b/LICENSE.txt
@@ -1,7 +1,7 @@
 Copyright (c) 2010, Alexander Arsenovic
 All rights reserved.
 
-Copyright (c) 2017, scikit-rf Developers
+Copyright (c) 2020, scikit-rf Developers
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
