Update copyright years and information.

A couple of files had been updated, but I missed updating the years
for copyright in them.  Also, the README file should mention all the
authors, not just me (Kent Engström has made one contribution).

README

 This is a Puppet module for managing Apache httpd.
-Copyright © 2014-2020 Thomas Bellman
+Copyright © 2014-2022  Thomas Bellman, Kent Engström.
 
 
 ===== LICENSING =====

manifests/include_file.pp

-# Copyright (C) 2014-2020 Thomas Bellman.
+# Copyright (C) 2014-2022 Thomas Bellman.
 # Licensed under the GNU LGPL v3+; see the README file for more information.
 
 

manifests/named_vhost.pp

-# Copyright (C) 2014-2020 Thomas Bellman.
+# Copyright (C) 2014-2022 Thomas Bellman.
 # Licensed under the GNU LGPL v3+; see the README file for more information.