Updated CHANGELOG

Author: thijskok

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/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.3.0] - 2021-03-11
+### Added
+- Response data validation
+
 ## [1.2.0] - 2021-01-07
 ### Added
 - Guzzle 7 support