[libdmapsharing] Adjust README-Porting for increased use of GError

[W. Michael Petullo <wmpetullo src gnome org>]

commit e2bf0974b21989de262cc0d134299d6cb4d7b8d8
Author: W. Michael Petullo <mike flyn org>
Date:   Sun Mar 25 19:36:41 2018 -0400

    Adjust README-Porting for increased use of GError
    
    Signed-off-by: W. Michael Petullo <mike flyn org>

 README-Porting |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/README-Porting b/README-Porting
index da40623..0ac6bd1 100644
--- a/README-Porting
+++ b/README-Porting
@@ -79,3 +79,15 @@ as object types instead of pointer types.
 
 (11) The properties contained in a DmapMdnsService must now be accessed
 using g_object_get.
+
+(12) The following methods now take a GError ** as their last argument:
+
+       (a) dmap_record_factory_create().
+
+       (b) dmap_db_add(), dmap_db_add_with_id(), and dmap_db_add_path().
+
+       (c) dmap_share_serve().
+
+       (d) dmap_share_publish().
+
+       (e) dmap_container_record_add_entry().