Add changelog

Author: devblackops

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/).
+
+## [1.1.0] - Unreleased
+
+### Added
+
+- Ability to specify parameter overrides to Pester tests
+- Ability to specify Pester tests to execute based on tag(s).
+
+## [1.0.1] - 2015-12-05
+
+### Changed
+
+- Handle version specific directories.
+
+## [1.0.0] - Unreleased
+
+### Added
+
+- Initial release