Update CHANGELOG.md

Author: marickvantuil

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## 3.5.1 - 2023-05-27
+
+**Changed**
+
+- Bumped PHPSeclib from 2.x to 3.x
+
+**Fixed**
+
+- Fixed #104
+
 ## 3.5.0 - 2023-04-09
 
 **Added**