DOC: update CHANGELOG

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## v5.1.0, 2021.12.20
+
+### Added
+
+- allow to use quickly API Particulier (customize API_PARTICULIER_URL and ENCRYPTION_SERVICE_SALT in DS .env file)
+
 ## v5.0.0, 2021.12.07
 
 ### Changed