Update RELEASENOTES.md

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@@ -6,6 +6,9 @@ An extensively enhanced and updated backend for SNDIO thanks to the work of [t6]
 
 SNDIO is *"the software layer of the OpenBSD operating system that manages the use of sound cards and MIDI ports."* Additionally, SNDIO *"... pays special attention to synchronization mechanisms and reliability required by music applications"*, hopefully opening up the possibility of synchronisation native to \*BSD.
 
+**Enhancements**
+* Fixed some warnings detected by `clang` on FreeBSD.
+
 Version 3.1s5
 ====
 Generally, more extensive changes have been to make all relevant operations reentrant.