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

[Arnaud Bonatti <arnaudb src gnome org>]

commit 9faffc130483dbf0c19b150d9112d86852ebc587
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Feb 22 21:39:13 2015 +0100

    Bump Gtk+ required version to 3.15.0.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index dbf0107..63e597a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ dnl ###########################################################################
 dnl Dependencies
 dnl ###########################################################################
 
-GTK_REQUIRED=3.12.0
+GTK_REQUIRED=3.15.0
 GLIB_REQUIRED=2.32
 RSVG_REQUIRED=2.36.2
 CANBERRA_GTK_REQUIRED=0.26