Update change log

Author: sagikazarmark

CHANGELOG.md

@@ -1,37 +1,49 @@
 # Change Log
 
-## 2.0.0
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+
+## [2.0.0]
 
 ### Added
 
 - Support for HTTPlug 2.0 and PSR-18
 
 ### Changed
 
-- `Client` and `Promise` are both final. 
+- `Client` and `Promise` are both final
 
 ### Removed
 
 - Support for PHP <7.1
 
-## 1.1.1 - 2016-05-10
+
+## [1.1.1] - 2016-05-10
 
 ### Fixed
 
 - Adapter can again be instantiated without a guzzle client.
 
-## 1.1.0 - 2016-05-09
+
+## [1.1.0] - 2016-05-09
 
 ### Added
 
 - Factory method Client::createWithConfig to create an adapter with custom
   configuration for the underlying guzzle client.
 
 
-## 1.0.0 - 2016-01-26
+## [1.0.0] - 2016-01-26
 
 
-## 0.4.1 - 2016-01-13
+## [0.4.1] - 2016-01-13
 
 ### Changed
 
@@ -42,15 +54,21 @@
 - Client common dependency
 
 
-## 0.4.0 - 2016-01-12
+## [0.4.0] - 2016-01-12
 
 ### Changed
 
 - Updated package files
 - Updated HTTPlug to RC1
 
 
-## 0.2.1 - 2015-12-17
+## [0.3.1] - 2015-12-31
+
+
+## [0.3.0] - 2015-12-31
+
+
+## [0.2.1] - 2015-12-17
 
 ### Added
 
@@ -61,7 +79,7 @@
 - Guzzle setup conforms to HTTPlug requirement now: Minimal functionality in client
 
 
-## 0.2.0 - 2015-12-15
+## [0.2.0] - 2015-12-15
 
 ### Added
 
@@ -77,3 +95,16 @@
 ### Added
 
 - Initial release
+
+
+[Unreleased]: https://github.com/php-http/guzzle6-adapter/compare/v2.0.0...HEAD
+[2.0.0]: https://github.com/php-http/guzzle6-adapter/compare/v1.1.1...v2.0.0
+[1.1.1]: https://github.com/php-http/guzzle6-adapter/compare/v1.1.0...v1.1.1
+[1.1.0]: https://github.com/php-http/guzzle6-adapter/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/php-http/guzzle6-adapter/compare/v0.4.1...v1.0.0
+[0.4.1]: https://github.com/php-http/guzzle6-adapter/compare/v0.4.0...v0.4.1
+[0.4.0]: https://github.com/php-http/guzzle6-adapter/compare/v0.2.1...v0.4.0
+[0.3.1]: https://github.com/php-http/guzzle6-adapter/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/php-http/guzzle6-adapter/compare/v0.2.1...v0.3.0
+[0.2.1]: https://github.com/php-http/guzzle6-adapter/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/php-http/guzzle6-adapter/compare/v0.1.0...v0.2.0