Update change log

Author: sagikazarmark

CHANGELOG.md

@@ -1,17 +1,28 @@
 # Change Log
 
+
+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
+
+
 ## 2.1.0 - 2017-12-21
 
 ### Changed
 
 - Added compatibility with `react/http-client` v0.5 (compatibility with v0.4 kept)
 - `ReactFactory::buildHttpClient` now accepts a `\React\Socket\ConnectorInterface` (only for `react/http-client` v0.5).
-If none provided, will use React HTTP Client defaults. 
+If none provided, will use React HTTP Client defaults.
 
 ### Deprecations
 - Passing a `\React\Dns\Resolver\Resolver` to `ReactFactory::buildHttpClient` is deprecated and will be removed in **3.0.0**.
 To control connector behavior (DNS, timeout, etc), pass a `\React\Socket\ConnectorInterface` instead.
 
+
 ## 2.0.0 - 2017-09-18
 
 ### Changed
@@ -22,12 +33,14 @@ To control connector behavior (DNS, timeout, etc), pass a `\React\Socket\Connect
 
 - Promise adapter rewrote to handle chain operation
 
+
 ## 1.0.0 - 2017-07-08
 
 ### Changed
 
 - Tests update to last version
 
+
 ## 0.3.0 - 2016-11-07
 
 ### Changed
@@ -71,3 +84,14 @@ This change was introduce in https://github.com/reactphp/http-client/pull/66.
 ## 0.1.0 - 2016-03-02
 
 - Initial release
+
+
+[Unreleased]: https://github.com/php-http/react-adapter/compare/2.1.0...HEAD
+[2.1.0]: https://github.com/php-http/react-adapter/compare/v2.0.0...2.1.0
+[2.0.0]: https://github.com/php-http/react-adapter/compare/1.0.0...v2.0.0
+[1.0.0]: https://github.com/php-http/react-adapter/compare/v0.3.0...1.0.0
+[0.3.0]: https://github.com/php-http/react-adapter/compare/v0.2.2...v0.3.0
+[0.2.2]: https://github.com/php-http/react-adapter/compare/v0.2.1...v0.2.2
+[0.2.1]: https://github.com/php-http/react-adapter/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/php-http/react-adapter/compare/v0.1.1...v0.2.0
+[0.1.1]: https://github.com/php-http/react-adapter/compare/v0.1.0...v0.1.1