[gtk+] Add to release notes

[Matthias Clasen <matthiasc src gnome org>]

commit 390dd37656945e26ad6953de0c9af7a86dc74133
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 17 06:53:37 2015 -0400

    Add to release notes
    
    Mention that GtkSearchEntry now 'eats' some keys.

 README.in |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/README.in b/README.in
index b1e1fd0..173a01c 100644
--- a/README.in
+++ b/README.in
@@ -99,6 +99,11 @@ Release notes for 3.16
   has non-scrolling parts similar to treeview headers, there is no need
   to implement this vfunc.
 
+* The GtkSearchEntry widget has gained a number of new signal that
+  are emitted when certain key sequences are seen. In particular, it
+  now handles the Escape key and emits ::stop-search. Applications that
+  expect to handle Escape themselves will need to be updated.
+
 Release notes for 3.14
 ======================