qapi/introspect.py: Update copyright and authors list

To reflect the work that went into strictly typing introspect.py,
punish myself by claiming credit.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210216021809.134886-17-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

scripts/qapi/introspect.py

@@ -1,10 +1,11 @@
 """
 QAPI introspection generator
 
-Copyright (C) 2015-2018 Red Hat, Inc.
+Copyright (C) 2015-2021 Red Hat, Inc.
 
 Authors:
  Markus Armbruster <armbru@redhat.com>
+ John Snow <jsnow@redhat.com>
 
 This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.