[pyatspi2] events: Replace object:text-reading-position with screen-reader:region-changed

[Mike Gorse <mgorse src gnome org>]

commit e9c1fc617822666f2ed6730aaa5fcf707654b24f
Author: Mike Gorse <mgorse alum wpi edu>
Date:   Thu Jul 18 19:00:36 2019 -0500

    events: Replace object:text-reading-position with screen-reader:region-changed
    
    Per discussion at https://gitlab.gnome.org/GNOME/orca/issues/36

 pyatspi/constants.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pyatspi/constants.py b/pyatspi/constants.py
index e40285b..d250e02 100644
--- a/pyatspi/constants.py
+++ b/pyatspi/constants.py
@@ -111,8 +111,6 @@ EVENT_TREE = {
     'object:children-changed:remove'],
   'object:state-changed' :
     ['object:state-changed:'],
-  'object:text-reading-position' :
-      ['object:text-reading-position:'],
   'mouse' :
     ['mouse:abs',
     'mouse:rel',
@@ -124,6 +122,8 @@ EVENT_TREE = {
     'mouse:button:2r',
     'mouse:button:3p',
     'mouse:button:3r'],
+  'screen-reader' :
+    ['screen-reader:region-changed'],
   'window' :
     ['window:minimize',
     'window:maximize',