Update CHANGELOG.md

Author: jumbojett

CHANGELOG.md

@@ -4,7 +4,7 @@ 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]
+## [0.9.2]
 
 ### Added
 * Support for [PKCE](https://tools.ietf.org/html/rfc7636). Currently the supported methods are 'plain' and 'S256'.