[orca] Bump minimum version of AT-SPI2

[Joanmarie Diggs <joanied src gnome org>]

commit 238c3ffebd45c1d44a59813ede58f6843652636c
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sat Dec 16 10:32:43 2017 +0100

    Bump minimum version of AT-SPI2
    
    This is needed to support more roles and also convert to new accessible
    text API.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0303d15..61d3ec1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,8 +5,8 @@ m4_define([orca_version],
           [orca_major_version.orca_minor_version.orca_micro_version])
 
 m4_define(pygobject_required_version, 3.18)
-m4_define(atspi_required_version, 2.18)
-m4_define(atkbridge_required_version, 2.18)
+m4_define(atspi_required_version, 2.26)
+m4_define(atkbridge_required_version, 2.26)
 
 AC_INIT([orca],
         [orca_version],