[gtkmm/gtkmm-2-20] Mark the branch in the ChangeLog

[Murray Cumming <murrayc src gnome org>]

commit edf86313a0834348263c1a722f1020ea82a6e4c5
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon May 17 21:16:48 2010 +0200

    Mark the branch in the ChangeLog

 ChangeLog |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 508e2ca..cbed4fa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+This is the gtkmm-2-20 branch. See the gtkmm-2-22 branch for new API 
+and see the master branch for the planned API/ABI-breaking gtkmm 3.
+
 2.20.3:
 
 2010-05-04  Murray Cumming  <murrayc murrayc com>