Update RELEASENOTES-DEVELOPMENT.md

Add note about the `dasl-tapered` volume control profile
mikebrady · Jul 17, 2023 · 0319cf3 · 0319cf3
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+Version 4.2.1d0-46-g57061dfb
+====
+**Enhancement**
+* Add a new volume-control profile called `dasl-tapered`. Shairport Sync already has two volume control profiles -- the `standard` profile -- which is the default -- and a `flat profile. A feature of the `dasl-tapered` profile is that halving the volume control setting (e.g. moving the volume slider from full to half, or from half to a quarter) reduces the output level by 10dB, which roughly corresponds with a perceived halving of the audio volume level. Many thanks to David Leibovic, aka [dasl-](https://github.com/dasl-) for this.
+To activate the `dasl-tapered` profile, set the `volume_control_profile` to `"dasl_tapered"` in the configuration file and restart Shairport Sync.
+There may be some more minor adjustments to this profile for devices with a restricted attenuation range...
+
 Version 4.2.1d0-40-g9ef4e351
 ====
 **Bug Fix**