Makefile, manual, website: Bump copyright year

Happy 2020!

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 6648cfc74954c02092c11d5c93344e1c6378533c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Makefile

@@ -2,7 +2,7 @@
 #
 # Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
 # Copyright (C) 2006-2014 by the Buildroot developers <buildroot@uclibc.org>
-# Copyright (C) 2014-2019 by the Buildroot developers <buildroot@buildroot.org>
+# Copyright (C) 2014-2020 by the Buildroot developers <buildroot@buildroot.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

docs/manual/manual.txt

@@ -12,7 +12,7 @@ It is licensed under the GNU General Public License, version 2. Refer to the
 http://git.buildroot.org/buildroot/tree/COPYING?id={sys:git rev-parse HEAD}[COPYING]
 file in the Buildroot sources for the full text of this license.
 
-Copyright (C) 2004-2019 The Buildroot developers
+Copyright (C) 2004-2020 The Buildroot developers
 
 image::logo.png[]
 

docs/website/copyright.txt

@@ -1,6 +1,6 @@
 
 The code and graphics on this website (and it's mirror sites, if any) are
-Copyright (c) 1999-2005 by Erik Andersen, 2006-2019 The Buildroot
+Copyright (c) 1999-2005 by Erik Andersen, 2006-2020 The Buildroot
 developers. All rights reserved.
 
 Documents on this Web site including their graphical elements, design, and