[polari] configure: bump gtk+ version

[Kunal Jain <kunaljain src gnome org>]

commit 3c70c7366b2d03094e25103090a6d541ce53763a
Author: Kunaal Jain <kunaalus gmail com>
Date:   Sat Apr 16 02:20:30 2016 +0530

    configure: bump gtk+ version
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765124

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e53aab8..f1dbb0a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,7 +33,7 @@ GLIB_GSETTINGS
 PKG_CHECK_MODULES(POLARI,
                   gio-2.0 >= 2.43.4
                   gobject-introspection-1.0
-                  gtk+-3.0 >= 3.15.6
+                  gtk+-3.0 >= 3.19.12
                   telepathy-glib);
 
 AC_CHECK_FUNCS([strcasestr])