Update RELEASENOTES-DEVELOPMENT.md

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+Version 4.3.2-dev-58-gb70dd463
+===
+**Investigation -- continued**
+* Return `501` ("Not Implemented") instead of `200` ("OK") in response to a `POST` message with the argument `/feedback` on a Classic AirPlay connection. 
+
 Version 4.3.2-dev-56-g4cd3c1da
 ===
 **Investigation**