[epiphany] build: Bump required GTK+ version

[Yosef Or Boczko <yoseforb src gnome org>]

commit dbb3e369206f205cc0783bd5b1e07cacab7124f8
Author: Yosef Or Boczko <yoseforb src gnome org>
Date:   Fri May 23 00:25:16 2014 +0300

    build: Bump required GTK+ version
    
    https://bugzilla.gnome.org/show_bug.cgi?id=730598

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index dff1cfe..fb29bac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -66,7 +66,7 @@ GNOME_CODE_COVERAGE
 MORE_WARN_FLAGS="-Wdeclaration-after-statement -Wno-deprecated-declarations"
 
 GLIB_REQUIRED=2.38.0
-GTK_REQUIRED=3.11.6
+GTK_REQUIRED=3.13.0
 LIBXML_REQUIRED=2.6.12
 LIBXSLT_REQUIRED=1.1.7
 WEBKIT_GTK_REQUIRED=2.4.0