Merge pull request #114 from SethTisue/copyright-2020

copyright 2020

Author: Sciss

NOTICE

@@ -1,8 +1,8 @@
 scala-swing
 
-Copyright (c) 2002-2019 EPFL
-Copyright (c) 2011-2019 Lightbend, Inc.
-Copyright (c) 2019 contributors
+Copyright (c) 2002-2020 EPFL
+Copyright (c) 2011-2020 Lightbend, Inc.
+Copyright (c) 2019-2020 contributors
 
 Licensed under the Apache License, Version 2.0 (the "License").
 Unless required by applicable law or agreed to in writing, software