mercurial.el: add forgotten version number
The number was accidentally removed in the change from GPLv2 to GPLv2+
in
25e572394f5c.
--- a/contrib/mercurial.el Sun Jan 17 01:52:36 2010 +0100
+++ b/contrib/mercurial.el Wed Jan 20 16:48:20 2010 +0100
@@ -5,8 +5,8 @@
;; Author: Bryan O'Sullivan <bos@serpentine.com>
;; mercurial.el is free software; you can redistribute it and/or
-;; modify it under the terms of the GNU General Public License or any
-;; later version.
+;; modify it under the terms of the GNU General Public License version
+;; 2 or any later version.
;; mercurial.el is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of