[gparted] Update copyright years

[Curtis Gedak <gedakc src gnome org>]

commit 77de6648815459089aed61b38161810e188c0a5d
Author: Curtis Gedak <gedakc gmail com>
Date:   Mon Jan 20 09:56:07 2020 -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 abad243b..a7c5e646 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) 2008-2019
+Portions Copyright (C) 2008-2020
        Curtis Gedak
-Portions Copyright (C) 2011-2019
+Portions Copyright (C) 2011-2020
        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 176b8448..e1beefe0 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 © 2008-2019 Curtis Gedak" ;
-       names += "\nCopyright © 2011-2019 Mike Fleetwood" ;
+       names += "\nCopyright © 2008-2020 Curtis Gedak" ;
+       names += "\nCopyright © 2011-2020 Mike Fleetwood" ;
        dialog .set_copyright( names ) ;
 
        //authors