Add a CHANGELOG entry for #16

Author: williamdes

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).
 
+## [v1.6.2] - 2021-04-03
+
+- Set FCMManager::getContainer public
+
 ## [v1.6.1]
 
 - Fix PHP 8.0 support