[gnome-contacts] Bump gtk+ dependency to >= 3.20

[Andreas Henriksson <ah src gnome org>]

commit fefba769d9173a4cad9d882b7dad16efd28a591d
Author: Andreas Henriksson <andreas fatal se>
Date:   Wed Apr 20 14:07:24 2016 +0200

    Bump gtk+ dependency to >= 3.20
    
    Uses gtk_widget_set_focus_on_click API which is new in 3.20.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765147

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a82af90..1aeabd3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,7 @@ AC_DEFINE_UNQUOTED([GETTEXT_PACKAGE], ["$GETTEXT_PACKAGE"], [Gettext Package])
 AC_SUBST(GETTEXT_PACKAGE)
 
 
-pkg_modules="gtk+-3.0 >= 3.16.0
+pkg_modules="gtk+-3.0 >= 3.20.0
             glib-2.0 >= 2.37.6
             gmodule-export-2.0
             gnome-desktop-3.0