Update changelog

Author: genail

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [UNRELEASED]
+## [3.5.1]
 ### Added
 - Global lock release on Ctrl+C during the operation