[glibmm] Improve ChangeLog

[Murray Cumming <murrayc src gnome org>]

commit 279a4cab863534db3a830e0980d2301cdbda3d51
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Mar 16 11:48:54 2011 +0100

    Improve ChangeLog

 ChangeLog |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 4dfdeb4..d44acbd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15,6 +15,8 @@
 	variants of type Variant<T>. This allow, for example, to define variants
 	of type Variant<std::map<ustring, VariantBase> >.
 
+	Bug #644207.
+
 2011-03-14  Yannick Guesnet  <Yannick Guesnet univ-rouen fr>
 
   Variant: Add a cast operator.