[gtksourceview/wip/chergert/vim] add since

[Christian Hergert <chergert src gnome org>]

commit ad2f0b2220e57aecdb76f36c2fce0f7bfdd682a9
Author: Christian Hergert <chergert redhat com>
Date:   Fri Oct 29 16:43:52 2021 -0700

    add since

 gtksourceview/gtksourcevimimcontext.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtksourceview/gtksourcevimimcontext.c b/gtksourceview/gtksourcevimimcontext.c
index 925937d1..5918a4d3 100644
--- a/gtksourceview/gtksourcevimimcontext.c
+++ b/gtksourceview/gtksourcevimimcontext.c
@@ -32,6 +32,7 @@
  * @title: GtkSourceVimIMContext
  * @short_description: VIM emulation
  *
+ * Since: 5.4
  */
 
 struct _GtkSourceVimIMContext