[gtk+] Update release notes for 3.6

[Matthias Clasen <matthiasc src gnome org>]

commit 1ab0ce6401e5040436b865c1aa5552cdfc17fad1
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 24 18:51:51 2012 -0400

    Update release notes for 3.6

 README.in |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/README.in b/README.in
index 0fe846d..b5d9f30 100644
--- a/README.in
+++ b/README.in
@@ -75,8 +75,17 @@ Patches should be in unified diff form. (The -up option to GNU diff.)
 Release notes for 3.6
 =====================
 
-* Now follows the XDG Base Directory specification for user
-  configuration and data files. In detail,
+* The accessibility bridge code that exports accessible objects
+  on the bus is now used by default; atk-bridge has been converted
+  into a library that GTK+ links against. To void the linking,
+  pass --without-atk-bridge when configuring GTK+.
+
+* GDK threading support has been deprecated. It is recommended to
+  use g_idle_add(), g_main_context_invoke() and similar funtions
+  to make all GTK+ calls from the main thread.
+
+* GTK+ now follows the XDG Base Directory specification for
+  user configuration and data files. In detail,
   * $XDG_CONFIG_HOME/gtk-3.0/custom-papers is the new location
     for $HOME/.gtk-custom-papers
   * $XDG_CONFIG_HOME/gtk-3.0/bookmarks is the new location