Add CHANGELOG.md

Author: bbrala

CHANGELOG.md

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+# Changelog
+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]
+
+### Added
+
+* Added CHANGELOG.md
+
+## [0.5.0] - 2018-03-06
+
+### Added 
+
+* Added a proper README with instructions.
+
+### Changed
+
+* Updated namespace to `Swis\JsonApi\Client` for consistency.
+* Split service provider binds so overwriting is easier.
+
+### Removed
+
+* Extracted fixtures client to  [swisnl/php-http-fixture-client](https://github.com/swisnl/php-http-fixture-client) and [swisnl/guzzle-fixture-handler](https://github.com/swisnl/guzzle-fixture-handler)
+* Removed resources as it was redundant.
+
+## [0.4.0] - 2018-01-16
+
+### Changed
+
+Refactored to use [php-http/httpplug](http://docs.php-http.org/en/latest/index.html) instead of Guzzle so the library doesn't depend on a specific http client implementation.
+
+This does change how you customize the ServiceProvider, just include an adapter for the client you want to use and the library uses [autodiscovery](http://docs.php-http.org/en/latest/discovery.html) to find the correct [adapter/client](http://docs.php-http.org/en/latest/clients.html). It also uses a [MessageFactory](http://docs.php-http.org/en/latest/message/message-factory.html) for creating Requests and Response objects.
+
+So for example, if you want to use Guzzle, just `composer require php-http/guzzle6-adapter`, and all should be swell.
+
+In order to have a working mock client for testing you now need to include [php-http/mock-client](http://docs.php-http.org/en/latest/clients/mock-client.html). Which is an easy way to mock requests.