Update copyright years

doc/manual/source/index.rst

@@ -25,7 +25,7 @@ The following people used to be members of the team:
 * Stéphane Lhuissier
 * George Perendia
 
-Copyright © 1996-2020, Dynare Team.
+Copyright © 1996-2021, Dynare Team.
 
 Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
 

license.txt

 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: Dynare
-Upstream-Contact: Dynare Team, whose members in 2020 are:
+Upstream-Contact: Dynare Team, whose members in 2021 are:
                   - Stéphane Adjemian <stephane.adjemian@univ-lemans.fr>
                   - Houtan Bastani <houtan@dynare.org>
                   - Michel Juillard <michel.juillard@mjui.fr>
@@ -22,7 +22,7 @@ Upstream-Contact: Dynare Team, whose members in 2020 are:
 Source: https://www.dynare.org
 
 Files: *
-Copyright: 1996-2020 Dynare Team
+Copyright: 1996-2021 Dynare Team
 License: GPL-3+
 
 Files: matlab/AIM/SP*