[gparted] Update copyright years

[Curtis Gedak <gedakc src gnome org>]

commit 423a57ec4ac584f59f60776fe430f845b9d1e830
Author: Curtis Gedak <gedakc gmail com>
Date:   Mon Jan 25 09:55:15 2021 -0700

    Update copyright years

 AUTHORS            | 4 ++--
 src/Win_GParted.cc | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/AUTHORS b/AUTHORS
index a7c5e646..38958375 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,9 +1,9 @@
 This file is part of GParted
 Copyright (C) 2004, 2005, 2006
        Bart Hakvoort
-Portions Copyright (C) 2008-2020
+Portions Copyright (C) 2008-2021
        Curtis Gedak
-Portions Copyright (C) 2011-2020
+Portions Copyright (C) 2011-2021
        Mike Fleetwood
 
 This file may be modified and/or distributed without restriction.  This is
diff --git a/src/Win_GParted.cc b/src/Win_GParted.cc
index e1beefe0..08d3cab3 100644
--- a/src/Win_GParted.cc
+++ b/src/Win_GParted.cc
@@ -1863,8 +1863,8 @@ void Win_GParted::menu_help_about()
        dialog .set_comments( _( "GNOME Partition Editor" ) ) ;
        std::string names ;
        names =    "Copyright © 2004-2006 Bart Hakvoort" ;
-       names += "\nCopyright © 2008-2020 Curtis Gedak" ;
-       names += "\nCopyright © 2011-2020 Mike Fleetwood" ;
+       names += "\nCopyright © 2008-2021 Curtis Gedak" ;
+       names += "\nCopyright © 2011-2021 Mike Fleetwood" ;
        dialog .set_copyright( names ) ;
 
        //authors