Add CHANGELOG

Author: danmichaelo

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](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+(nothing yet)
+
+## [0.7.0] - 2019-04-03
+
+### Changed
+- Update from httplug to PSR-17/PSR-18. With PSR-17 follows the requirement of a HTTP factory implementation.
+  Run `composer require http-interop/http-factory-guzzle` to continue using sru-client as before.
+
+- Remove support for PHP 5.6 and 7.0 because we updated the tests to work with PHPUnit 7+
+  and can no longer run tests on PHP < 7.1. Also, PHP 5.6 and PHP 7.0 have now reached end-of-life.
+
+## [0.6.4] - 2019-03-06
+### Fixed
+- Fix a few type hints.
+- Minor code style cleanups.
+
+## [0.6.3] - 2017-08-01
+### Added
+- Add support for setting custom headers.
+
+### Changed
+- Don't throw `ClientErrorException` on 4XX responses, since some servers return 4XX responses whenever there is a diagnostic message, including zero result queries. Diagnostic messages are better handled by our `Response` class.
+
+## [0.6.2] - 2017-08-01
+### Added
+- Add `__toString()` method to `Record` to allow simple string serialization.
+
+## [0.6.1] - 2017-08-01
+### Changed
+- Update from quitesimplexmlelement 0.x to 1.x.
+
+## [0.6.0] - 2017-07-01
+### Changed
+- Replace hard dependency on Guzzle with HTTPlug client discovery.
+  To continue use Guzzle, run `composer require php-http/guzzle6-adapter`
+
+[Unreleased]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.7.0...HEAD
+[0.7.0]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.6.4...v0.7.0
+[0.6.4]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.6.3...v0.6.4
+[0.6.3]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.6.2...v0.6.3
+[0.6.2]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.6.1...v0.6.2
+[0.6.1]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.6.0...v0.6.1
+[0.6.0]: https://github.com/olivierlacan/keep-a-changelog/releases/tag/v0.6.0