Update RELEASENOTES.md

RELEASENOTES.md

@@ -1,3 +1,9 @@
+Version 2.9.2 – Development Version
+----
+Version 2.9.2 focusses on further bug fixes and stability improvements.
+* An important bug has been fixed in the handling of missing audio frames – i.e. what happens when a frame of audio is truly missing, in spite of having been re-requested. The bug would cause Shairport Sync to do an unnecessary resynchronisation, or, if resync was turned off, to jump out of sync. This is a long-standing bug – thanks to [Jörg Krause](https://github.com/joerg-krause) for identifying it.
+* An extra diagnostic has been added which gives the mean, standard deviation and maximum values for inter-packet reception time on the audio port. It may be useful for exploring line quality.
+
 Version 2.9.1 – Development Version
 ----
 Version 2.9.1 focusses on bug fixes and stability improvements.
@@ -24,8 +30,8 @@ Version 2.8 is derived from version 2.7.10 with slight documentation updates. He
 * Disabled picture sending if pictures haven’t been asked for.
 
 **Bug fixes**
-* Fixed a bug that prevented Shairport Sync from correctly setting the hardware mixer volume if it had been altered externally.
-* Modified the shutdown behaviour so that a shutdown followed immediately by a play request is handled properly. This was causing iOS 9.2 sometimes to drop the Airplay link between tunes.
+* Fixed a bug that prevented Shairport Sync from correctly setting the hardware mixer volume if it had been altered externally. Thanks to [Tim Curtis](https://github.com/moodeaudio) for help with these issues.
+* Modified the shutdown behaviour so that a shutdown followed immediately by a play request is handled better. This was causing iOS 9.2 sometimes to drop the Airplay link between tunes.
 * Fixed a data-alignment bug that would cause a crash in certain circumstances on ARM processors with metadata enabled.
 * Corrected the names for a few settings tags.
 * Fixed some typos and misspellings.