update changelog

Author: tkostuch

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 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).
 
+## [1.12.2] - UNRELEASED
+
+### Added
+
+
+### Fixed
+
+- Use productEquals to compare products in o2m - @gibkigonzo (#477)
 
 ## [1.12.1] - 2020.06.22