[glade] Bumping required GTK+ version to 3.9.0

[Tristan Van Berkom <tvb src gnome org>]

commit dce660ca4c184a4f37c7b2946a452f0664335b6a
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Mon Apr 15 15:59:20 2013 +0900

    Bumping required GTK+ version to 3.9.0

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 13735e9..7d741e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,7 +130,7 @@ GOBJECT_INTROSPECTION_CHECK([0.10.1])
 dnl ================================================================
 dnl Check for gtk+
 dnl ================================================================
-GTK_REQUIRED=3.8.0
+GTK_REQUIRED=3.9.0
 PKG_CHECK_MODULES([GTK],[
   gtk+-3.0 >= $GTK_REQUIRED
   gmodule-2.0