update copyright information

Author: chewiebug

LICENSE.txt

@@ -1,7 +1,7 @@
 GCViewer helps you to analyse java garbage collection log files. 
 
 Copyright (c) 2002-2008 tagtraum industries incorporated.
-Copyright (c) 2011-2019 Joerg Wuethrich and contributors
+Copyright (c) 2011-2020 Joerg Wuethrich and contributors
 
 LGPL
 ====

src/main/java/com/tagtraum/perf/gcviewer/view/AboutDialog.java

@@ -92,7 +92,7 @@ public AboutDialog(Frame f) {
         versionPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
         versionPanel.setLayout(new GridBagLayout());
 
-        JLabel copyright = new JLabel("\u00A9" + " 2011-2019: Joerg Wuethrich and contributors", JLabel.CENTER);
+        JLabel copyright = new JLabel("\u00A9" + " 2011-2020: Joerg Wuethrich and contributors", JLabel.CENTER);
 
         JLabel contributorsLabel = new JLabel("contributors (alphabetically ordered):", JLabel.CENTER);
         contributorsLabel.setForeground(Color.GRAY);