Introduce changelog

Author: vearutop

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]
+
+## [0.2.19] - 2019-10-02
+
+### Added
+- Schema exporter split into protected methods to allow extension.
+
+## [0.2.18] - 2019-09-22
+
+### Fixed
+- Description trimming bug.
+
+[Unreleased]: https://github.com/swaggest/php-code-builder/compare/v0.2.19...HEAD
+[0.2.19]: https://github.com/swaggest/php-code-builder/compare/v0.2.18...v0.2.19
+[0.2.18]: https://github.com/swaggest/php-code-builder/compare/v0.2.17...v0.2.18