Add CHANGELOG.md

Author: tomphp

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [0.1.0] - 2016-09-08
+### Added
+ * `printf` style message formatting.
+ * Utility function to convert the type of a variable to a string.
+ * Utility function to convert the value of a variable to a string.
+ * Utility function to convert a list of values to a string.