Update copyright file

debian/copyright

@@ -4,12 +4,19 @@ Upstream-Contact: Alexander Barton <alex@barton.de>
 Source: https://ngircd.barton.de/
 
 Files: *
-Copyright: 2001-2017 Alexander Barton <alex@barton.de> and contributors.
+Copyright: 2001-2020 Alexander Barton <alex@barton.de> and contributors.
 License: GPL-2+
 Comment: See /usr/share/doc/ngircd/AUTHORS for the full list of
  authors and contributors.
 
 Files:
+ contrib/de.barton.ngircd.metainfo.xml
+Copyright: 2001-2020 Alexander Barton <alex@barton.de> and contributors.
+License: MIT
+Comment: See /usr/share/doc/ngircd/AUTHORS for the full list of
+ authors and contributors.
+
+Files:
  debian/*
 Copyright:
  2005-2008 Mario Iseli <admin@marioiseli.com>,
@@ -37,3 +44,22 @@ License: GPL-2+
  On Debian systems, the full text of the GNU General Public
  License version 2 can be found in the file
  `/usr/share/common-licenses/GPL-2'.
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to
+ deal in the Software without restriction, including without limitation the
+ rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ sell copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ IN THE SOFTWARE.