add changelog file

Author: foamzou

CHANGELOG.md

@@ -0,0 +1,30 @@
+# 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).
+
+## [5.1.3] - 2022-07-20
+### Added
+- Add API: POST `estimated-delivery-date/predict-batch`
+
+## [5.1.2] - 2021-03-17
+### Added
+- Add additional_fields params for each API request
+
+## [5.1.1] - 2017-08-21
+### Added
+- Better handle UTF-8 encodings
+
+## [5.1.0] - 2017-07-14
+### Added
+- comply to psr-2 (get_by_id -> getById)
+- use psr-4 to autoload files rather than psr-0
+- rewrite example/testing.php file
+- added travis for CI
+- added unit tests
+- configured code climate for code quality monitoring.
+
+## [5.0.10] - 2017-01-17
+### Added
+- add back empty constructor in request