Technical/Update changelog (#208)

Author: bestwebua

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 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).
 
+## [2.5.1] - 2025-06-24
+
+### Added
+
+- Added [ability to use special characters in email regex pattern](https://github.com/mocktools/go-smtp-mock/pull/207)
+
 ## [2.5.0] - 2025-05-31
 
 ### Added