[epiphany] Bump GTK+ requirement to GNOME 3.22.0

[Iulian Radu <iulianradu src gnome org>]

commit 7b39d487458eb3744c4f5977e4b8d05ba9f527fa
Author: Iulian Radu <iulian radu67 gmail com>
Date:   Wed Sep 28 15:26:51 2016 +0300

    Bump GTK+ requirement to GNOME 3.22.0

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 5ff46f9..1b7d1ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -98,7 +98,7 @@ LT_LIB_M
 
 AVAHI_REQUIRED=0.6.22
 GLIB_REQUIRED=2.44.0
-GTK_REQUIRED=3.19.1
+GTK_REQUIRED=3.22.0
 WEBKITGTK_REQUIRED=2.13.2
 
 PKG_CHECK_MODULES([AVAHI_CLIENT], [avahi-client >= $AVAHI_REQUIRED])