Add Changelog

Fix #38

CHANGELOG.md

@@ -0,0 +1,18 @@
+# rswag
+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]
+### Added
+- Support for Rails 6 [#228](https://github.com/rswag/rswag/pull/228)
+- Support for Windows paths [#176](https://github.com/rswag/rswag/pull/176)
+### Changed
+- Show response body when error code is not expected [#117](https://github.com/rswag/rswag/pull/177)
+### Deprecated
+### Removed
+### Fixed
+### Security
+
+## [2.0.5] - 2018-07-10