Added versionadded directive for the `bulk_create` Queryset method introduced in r16739.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16885 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/models/querysets.txt

@@ -1163,6 +1163,8 @@ bulk_create
 
 .. method:: bulk_create(objs)
 
+.. versionadded:: 1.4
+
 This method inserts the provided list of objects into the database in an
 efficient manner (generally only 1 query, no matter how many objects there
 are)::