DOCS: Prepare CHANGELOG.md for release - 2.0.0

CHANGELOG.md

@@ -4,8 +4,28 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+## [2.0.0] - 2021-03-15
+
+### Breaking Changes
+- Visibility of properties `$brandIdParameterKey` and `$secretKeyParameterKey` of trait ApiCredentialsTrait changed from public to private
+
+### Added
+- phpstan - static code analysis
+- New script to composer.json file - 'test'
+- Implement response message unit tests
+- Implement request messages unit tests
+- Add getter for httpMethod property
+
+### Changed
+- Implement psr-4 autoload for tests
+- Refactor initialize method of `AbstractRequest` class
+
 ## [1.0.0] - 2021-03-12
 ### Added
 - Initial release
 
+[Unreleased]: https://github.com/DeH4eG/omnipay-luminor/compare/v2.0.0...HEAD
+[2.0.0]: https://github.com/DeH4eG/omnipay-luminor/releases/tag/v2.0.0
 [1.0.0]: https://github.com/DeH4eG/omnipay-luminor/releases/tag/v1.0.0