[json-glib] json-types.h: Add missing JSON_AVAILABLE_IN_1_2

[Chun-wei Fan <fanchunwei src gnome org>]

commit 4c2ad10eda3e2cdc2714358f72882b5ac8cbf34f
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Apr 19 15:43:53 2016 +0800

    json-types.h: Add missing JSON_AVAILABLE_IN_1_2
    
    The json_node_is_immutable() missed an JSON_AVAILABLE_IN_1_2, causing it
    not to be exported.  Fix this.

 json-glib/json-types.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/json-glib/json-types.h b/json-glib/json-types.h
index 22e1147..d845f94 100644
--- a/json-glib/json-types.h
+++ b/json-glib/json-types.h
@@ -283,6 +283,7 @@ gboolean              json_node_is_null         (JsonNode     *node);
 
 JSON_AVAILABLE_IN_1_2
 void                  json_node_seal            (JsonNode     *node);
+JSON_AVAILABLE_IN_1_2
 gboolean              json_node_is_immutable    (JsonNode     *node);
 
 JSON_AVAILABLE_IN_1_2