[gedit] Require GTK 3.21.3 (for gtk_scrolled_window_set_max_content_height)

[Adam Dingle <adamd src gnome org>]

commit dbba650ebcf4e275f84467ba463b80a81e92f5bf
Author: Adam Dingle <adam medovina org>
Date:   Thu Sep 8 06:54:37 2016 -0700

    Require GTK 3.21.3 (for gtk_scrolled_window_set_max_content_height)

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e90cd33..da64884 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@ AC_SUBST(GEDIT_API_VERSION)
 
 # Dependencies
 GLIB_REQUIRED=2.44
-GTK_REQUIRED=3.19.0
+GTK_REQUIRED=3.21.3
 GTKSOURCEVIEW_REQUIRED=3.21.2
 LIBPEAS_REQUIRED=1.14.1
 LIBXML_REQUIRED=2.5.0