[gnome-builder] jsonrpc: update G-I annotation

[Christian Hergert <chergert src gnome org>]

commit 1fac037d8257e60be8a4b7f54c7da1ff4966f87a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Nov 23 17:22:05 2016 -0800

    jsonrpc: update G-I annotation

 contrib/jsonrpc-glib/jsonrpc-client.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/contrib/jsonrpc-glib/jsonrpc-client.c b/contrib/jsonrpc-glib/jsonrpc-client.c
index 40415ee..9456c10 100644
--- a/contrib/jsonrpc-glib/jsonrpc-client.c
+++ b/contrib/jsonrpc-glib/jsonrpc-client.c
@@ -501,7 +501,7 @@ jsonrpc_client_init (JsonrpcClient *self)
 
 /**
  * jsonrpc_client_new:
- * @io_stream: A #GIOStream
+ * @io_stream: (not nullable): A #GIOStream
  *
  * Creates a new #JsonrpcClient instance.
  *