better changelog

Author: Timi-Artturi Mäkelä

CHANGELOG.md

@@ -4,13 +4,12 @@ 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).
 
-[unreleased]
+[Unreleased]
 
 [php-81-automatic-conversion-hotfix]
 ### Fixed
 - Fixes "Automatic conversion of false to array is deprecated" on Dust.php
 
-[released]
 ## [1.38.1]
 
 ### Fixed