[vte] docs: Add missing Since: comment

[Christian Persch <chpe src gnome org>]

commit c6643cb5d41a31ea72927bc1981fd5ba10385697
Author: Christian Persch <chpe gnome org>
Date:   Tue Jan 20 18:21:17 2015 +0100

    docs: Add missing Since: comment

 src/vte.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/vte.c b/src/vte.c
index f5aec39..a2f9a2c 100644
--- a/src/vte.c
+++ b/src/vte.c
@@ -3532,6 +3532,8 @@ vte_get_user_shell (void)
  * Gets a list of features vte was compiled with.
  *
  * Returns: (transfer none): a string with features
+ *
+ * Since: 0.40
  */
 const char *
 vte_get_features (void)