Update RELEASENOTES-DEVELOPMENT.md

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+Version 3.3.7d7
+====
+**Enhancements**
+* Tidy up the creation and initials opening of pipes. Suppress multiple pipe-opening error messages.
+* Tidy up warnings and fatal error messages when log verbosity is zero.
+* Clean up the code that provides a silent lead-in to play on a back end without synchronisation, e.g. a pipe or `stdout`.
+* Added in commented-out code to check the timeliness of the release of audio to a back end without synchronisation, e.g. a pipe or `stdout`. TL;DR – so long as the back end does not block, frames will be released to it not more than one packet (352 frames) late.
+
 Version 3.3.7d7
 ====
 **Enhancements**