Update changelog

Author: meech-ward

CHANGELOG.md

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+# Change Log
+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]
+### Added
+
+### Changed
+
+
+## [0.2.0] - 2017-03-02
+### Added
+
+### Changed
+- Update Realm to version 2.4.x
+
+