Updated CHANGELOG

Author: oscarotero

CHANGELOG.md

@@ -5,13 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## UNRELEASED
+## [UNRELEASED]
 
 ### Added
 
 - Improved testing and added code coverage reporting
 - Added tests for PHP 7.2
 
+### Changed
+
+- Upgraded to the final version of PSR-15 `psr/http-server-middleware`
+
 ### Fixed
 
 - Updated license year
@@ -88,6 +92,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 First version
 
+[UNRELEASED]: https://github.com/middlewares/error-handler/compare/v0.9.0...HEAD
 [0.9.0]: https://github.com/middlewares/error-handler/compare/v0.8.0...v0.9.0
 [0.8.0]: https://github.com/middlewares/error-handler/compare/v0.7.0...v0.8.0
 [0.7.0]: https://github.com/middlewares/error-handler/compare/v0.6.0...v0.7.0