[gtkmm] Correct the ChangeLog

[Murray Cumming <murrayc src gnome org>]

commit 418f52405278213b45dc5c92bc18d4bc6498fb2c
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Apr 19 09:33:07 2012 +0200

    Correct the ChangeLog

 ChangeLog |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index e163bf8..05bc22d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,7 @@
 
 	* gtk/src/application.hg: The text seems to be based on an earlier version
 	of Gtk::Application or GtkApplication which created windows automatically.
+	Noticed by Mateusz Marzantowicz.
 
 2012-04-17  Alexandre Rostovtsev  <tetromino gentoo org>