Add Changelog

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
+- This change log file
+
+### Changed
+- PSR2 Formatting
+- Removed `newSubscription()` first parameter default value. *You should pass explicitly the subscription name*.
+
+## [0.2.1] - 2016-11-28
+### Added
+- Support for Laravel v5.3
+
+### Fixed
+- Typo in english translation
+
+## [0.2.0] - 2016-09-28
+### Added
+- Check for particular plan
+
+## [0.1.0] - 2016-09-16
+
+Initial Release