Fix markdown

Author: koppor

CHANGELOG.md

@@ -5,7 +5,11 @@ 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]
+
+### Changed
+
+- Refined `README.md`
 
 ## [2.2.0] – 2018-06-26