[pyclutter] Note that the AUTHORS file is not updated

[Emmanuele Bassi <ebassi src gnome org>]

commit 7d23e99000f5a95cbaff880afc41d81b0d07a316
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Apr 12 16:05:28 2015 +0100

    Note that the AUTHORS file is not updated

 AUTHORS |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/AUTHORS b/AUTHORS
index 0c6cac5..fa7dd71 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,3 +1,10 @@
+## DO NO MODIFY THIS FILE
+##
+## The contents of this file are not updated, and are kept only for
+## historical purposes.
+##
+## Please see the Git commit log for updated authorship
+
 Emmanuele Bassi <ebassi openedhand com>
 Robert Bradford <rob openedhand com>
 Ross Burton <ross openedhand com>