Update CHANGELOG

Author: mcasper

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).
 
+## [1.3.0]
+### Added
+- Support for Rails 6
+
 ## [1.2.0]
 ### Added
 - Support for using with the [strong_migrations](https://github.com/ankane/strong_migrations) gem