Update CHANGELOG

Author: mmistakes

CHANGELOG.md

@@ -5,6 +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/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased] -
+
+### Changed
+- Adjust default skin colors to meet WCAG 2 AA. [#68](https://github.com/mmistakes/jekyll-theme-basically-basic/pull/68)
+
 ## [1.4.0] - 2018-04-02
 
 ### Changed