Update changelog

Author: rkfg

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic
 Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.12.3]
+### Fixed
+- Relative amount parameters worked only from CLI, now they can be specified in
+  the configs too
 ## [1.12.2]
 ### Fixed
 - Payment after probing used the global rebalancing context instead of attempt