[gnome-sudoku] Bump Gtk+ required version to 3.13.4.

[Michael Catanzaro <mcatanzaro src gnome org>]

commit cc977f64baa5133b4ce7cfd9f866d924d0989f6a
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Sep 5 00:31:57 2014 +0200

    Bump Gtk+ required version to 3.13.4.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735806

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2b85caf..b6dbcaf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@ dnl Dependencies
 dnl ###########################################################################
 
 GLIB_REQUIRED=2.40.0
-GTK_REQUIRED=3.13.0
+GTK_REQUIRED=3.13.4
 QQWING_REQUIRED=1.2.0
 
 PKG_CHECK_MODULES(GNOME_SUDOKU, [