Update change log

Author: markdalgleish

CHANGELOG.md

@@ -3,8 +3,11 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased][unreleased]
+### Added
+- Pure mode where only local scope is allowed.
+
 ### Changed
-- Nothing yet.
+- Using global selectors outside of a global context now triggers warnings.
 
 ## [0.0.7] - 2015-05-30
 ### Changed