Add reference to issue in release note.

Author: anthony-tuininga

doc/src/release_notes.rst

@@ -18,7 +18,8 @@ Thin Mode Changes
 +++++++++++++++++
 
 #)  Fixed bug resulting in a segfault when a closed cursor is bound as a REF
-    CURSOR.
+    CURSOR
+    (`issue 368 <https://github.com/oracle/python-oracledb/issues/368>`__).
 
 Thick Mode Changes
 ++++++++++++++++++