Update changelog

Author: mikebronner

CHANGELOG.md

@@ -3,6 +3,10 @@ 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).
+## [0.3.3] - 10 Nov 2018
+### Fixed
+- typo in method `checkCooldownAndFlushAfterPersiting()` to 
+  `checkCooldownAndFlushAfterPersisting()`; thanks @jacobzlogar!
 
 ## [0.3.2] - 3 Nov 2018
 ### Added