Update changelog

Author: Ville Siltala

CHANGELOG.md

@@ -4,6 +4,11 @@ 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).
 
+## [1.29.4] - 2020-07-02
+
+### Fixed
+- Fix data handling in DustPress.js GET requests.
+
 ## [1.29.3] - 2020-06-16
 
 ### Fixed