bump version in Changelog

Author: Peter Geri

CHANGELOG.md

@@ -4,6 +4,10 @@ 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).
 
+## [6.0.1] - 2021-07-27
+### Fixed
+- Fix preg_match pattern by adding a slash (/) as a delimiter.
+
 ## [6.0.0] - 2021-06-22
 ### Changed
 - `enum` type are not anymore validated from generated client side.