Update CHANGELOG

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/).
 
+## UNRELEASED
+### Changed
+- Fixed CSV output when result objects have nested arrays and/or objects
+
 ## 1.3.2 - 2018-06-20
 ### Changed
 - Fixed math error in classroom count at total classroom needed expression