Update RELEASENOTES-DEVELOPMENT

RELEASENOTES-DEVELOPMENT.md

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+Version 4.0-dev-303-g9074069
+====
+#### New Features
+- An initial [PipeWire](https://pipewire.org) backend, with thanks to [Lukas Rusak](https://github.com/lrusak). Use the `--with-pw` configuration flag at the `./configure...` stage to include support.
+
+
+#### Bug Fixes
+- Fix a bug when using the `tinysvcmdns` mDNS implementation, with thanks to [fesc2000](https://github.com/fesc2000).
+- When an unrecognised SETUP message is received, just ignore it and put a warning in the log. Remove a redundant `client_setup_plist` data item from the `conn` data structure.
+
+#### Enhancements
+- Shairport Sync no longer needs to be in the same directory of NQPTP during compilation.
+- Add Docker automations -- thanks to [Charles Omer](https://github.com/charlesomer).
+- Add Issue management automations -- thanks to [Charles Omer](https://github.com/charlesomer).
+- Reconnect the DACP scanner for AirPlay 2. (It still isn't useful, unfortunately.)
+- Add initial support to allow dynamic modification of Rendezvous advertisements.
+- Simplify some UFW suggestions in the Troubleshooting Guide.
+- Merge some documentation changes from the `master` branch.
+- Add information to the Car Install Guide about improving boot times, thanks to [vasilisvg](https://github.com/vasilisvg)
+
 Version 4.0-dev-185-g0c02ee2
 ====