[clutter] Update release notes

[Emmanuele Bassi <ebassi src gnome org>]

commit d123e4b701a458b8674bd5f3dca20de8dc70f017
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Thu Mar 15 19:02:39 2012 +0000

    Update release notes

 README.in |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/README.in b/README.in
index d823331..d41d91a 100644
--- a/README.in
+++ b/README.in
@@ -289,6 +289,12 @@ features).
 Release Notes for Clutter 1.10
 -------------------------------------------------------------------------------
 
+â The ClutterActor::paint, ClutterActor::queue-redraw, and
+  ClutterActor::queue-relayout signals are now annotated as not allowing
+  signal emission hooks; this enables some optimization inside GLib, and
+  given the amount of emissions these three signals have, we want to get
+  through all the fast paths we can.
+
 â The ClutterActorBox parameter of the ClutterActor::allocation-changed
   signal is now marked as G_SIGNAL_TYPE_STATIC_SCOPE.