update changelog

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## Unreleased
+## Unreleased (included in latest dev build)
 
 - add sample rate check for funcubes/rtlsdr and restart dongle if there's an issue
 - improve radio error reporting in UI
@@ -13,6 +13,7 @@ All notable changes to this project will be documented in this file. The format
 - changed pulse detection for rtlsdr to 6dB to match FCD
 - added experimental AGC for rtlsdr, disabled by default, display current gain
 - make timeseries on radio page more robust to time jumps (still issues left)
+- add serial output feed capability
 
 ## [v2.0-rc14](https://sensorgnome.s3.amazonaws.com/images/sg-armv7-rpi-2.0-rc14.zip)