Update 'About' dialog

Author: emmanue1

app/src/main/java/org/jd/gui/view/AboutView.java

@@ -97,7 +97,7 @@ public AboutView(JFrame mainFrame) {
  hbox.add(Box.createHorizontalGlue());
 
  hbox = Box.createHorizontalBox();
- hbox.add(new JLabel("Copyright © 2008-2019 Emmanuel Dupuy"));
+ hbox.add(new JLabel("Copyright © 2008, 2019 Emmanuel Dupuy"));
  hbox.add(Box.createHorizontalGlue());
  subvbox.add(hbox);