[gnome-chess] Bump Gtk+ required version to 3.15.0...

[Arnaud Bonatti <arnaudb src gnome org>]

commit f1f9fd3f4d2da68251d0d1a2b9721058e5560385
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Feb 25 20:38:19 2015 +0100

    Bump Gtk+ required version to 3.15.0...
    
    ...and Valac's to 0.27.1.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c99d22a..998a271 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE([enable])
 GNOME_MAINTAINER_MODE_DEFINES
 
-AM_PROG_VALAC([0.26])
+AM_PROG_VALAC([0.27.1])
 AM_PROG_CC_C_O
 
 LT_PREREQ([2.2])
@@ -25,7 +25,7 @@ dnl Dependencies
 dnl ###########################################################################
 
 GLIB_REQUIRED=2.40
-GTK_REQUIRED=3.13.2
+GTK_REQUIRED=3.15.0
 RSVG_REQUIRED=2.32.0
 
 AC_SUBST([GLIB_REQUIRED])