Update RELEASENOTES-DEVELOPMENT.md

diff --git a/RELEASENOTES-DEVELOPMENT.md b/RELEASENOTES-DEVELOPMENT.md
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+Version 4.1-dev-350-g82849e0d
+====
+**Change**
+* Return 501 instead of 404 for unimplemented GETs in AirPlay 2 mode.
+
 Version 4.1-dev-347-g6556a79d
 ====
 **Bug Fix**