[pyatspi2] Add object:announcement to the list of events

[Mike Gorse <mgorse src gnome org>]

commit 26e983123b2d71e5c58ec45f8daa55820341adb4
Author: Mike Gorse <mgorse suse com>
Date:   Fri Jul 1 21:18:11 2022 -0500

    Add object:announcement to the list of events

 pyatspi/constants.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/pyatspi/constants.py b/pyatspi/constants.py
index e9d3add0..0d39aee8 100644
--- a/pyatspi/constants.py
+++ b/pyatspi/constants.py
@@ -90,7 +90,8 @@ EVENT_TREE = {
      'object:text-changed',
      'object:text-attributes-changed',
      'object:text-caret-moved',  
-     'object:attributes-changed'],
+     'object:attributes-changed',
+     'object:announcement'],
   'object:text-changed' :
     ['object:text-changed:insert',
     'object:text-changed:delete'],