[gtk+] README: Add note about gtk_text_view_add_child_in_window changes

[Alexander Larsson <alexl src gnome org>]

commit ceaeb02ade4bb5b4a8bd6d86d01f41f42481ea65
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Jan 10 12:08:11 2014 +0100

    README: Add note about gtk_text_view_add_child_in_window changes

 README.in |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/README.in b/README.in
index b70ab8f..e5d4249 100644
--- a/README.in
+++ b/README.in
@@ -87,6 +87,11 @@ Release notes for 3.12
   pack multiple widgets at the end of a headerbar will have to
   be updated.
 
+* gtk_text_view_add_child_in_window has changed behaviour a bit.
+  It now always positions the child in buffer coordinates, where
+  it used to inconsistently scroll with the buffer but then go
+  reposition to a window-relative position on redraw.
+
 Release notes for 3.10
 ======================