Add 0.20.0 to CHANGELOG

Ref. eng/recordflux/RecordFlux#1577

CHANGELOG.md

@@ -5,11 +5,11 @@ 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/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.20.0] - 2024-03-26
 
 ### Added
 
-- Allow multiple initial links in messages
+- Possibility to use multiple initial links in messages to allow the first message field to be defined by parameter values (AdaCore/RecordFlux#764, eng/recordflux/RecordFlux#764)
 
 ### Changed
 
@@ -494,7 +494,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.1.0] - 2019-05-14
 
-[Unreleased]: https://github.com/AdaCore/RecordFlux/compare/v0.19.0...HEAD
+[0.20.0]: https://github.com/AdaCore/RecordFlux/compare/v0.19.0...0.20.0
 [0.19.0]: https://github.com/AdaCore/RecordFlux/compare/v0.18.0...v0.19.0
 [0.18.0]: https://github.com/AdaCore/RecordFlux/compare/v0.17.0...v0.18.0
 [0.17.0]: https://github.com/AdaCore/RecordFlux/compare/v0.16.0...v0.17.0