[gtk+/gtk-3-22] Add a since tag

[Matthias Clasen <matthiasc src gnome org>]

commit 157b630d72c97584d0daa967b112f1b0f2994c6c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 19 13:29:17 2016 -0500

    Add a since tag

 gtk/gtkimcontextsimple.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkimcontextsimple.c b/gtk/gtkimcontextsimple.c
index a04224e..987e2b0 100644
--- a/gtk/gtkimcontextsimple.c
+++ b/gtk/gtkimcontextsimple.c
@@ -1453,6 +1453,8 @@ gtk_im_context_simple_add_table (GtkIMContextSimple *context_simple,
  * @compose_file: The path of compose file
  *
  * Adds an additional table from the X11 compose file.
+ *
+ * Since: 3.20
  */
 void
 gtk_im_context_simple_add_compose_file (GtkIMContextSimple *context_simple,