Update CHANGELOG.md

Author: Jeckerson

CHANGELOG.md

@@ -5,8 +5,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+
+## [1.4.0] - 2021-09-18
 ### Added
 - Added support for `mixed` type [#120](https://github.com/phalcon/php-zephir-parser/issues/120)
+- Add support for `yield` statement [#118](https://github.com/phalcon/php-zephir-parser/issues/118)
 
 ## [1.3.8] - 2021-09-08
 ### Changed
@@ -170,7 +173,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
  - Initial stable release
 
-[Unreleased]: https://github.com/phalcon/php-zephir-parser/compare/v1.3.8...HEAD
+[Unreleased]: https://github.com/phalcon/php-zephir-parser/compare/v1.4.0...HEAD
+[1.4.0]: https://github.com/phalcon/php-zephir-parser/compare/v1.3.8...v1.4.0
 [1.3.8]: https://github.com/phalcon/php-zephir-parser/compare/v1.3.7...v1.3.8
 [1.3.7]: https://github.com/phalcon/php-zephir-parser/compare/v1.3.6...v1.3.7
 [1.3.6]: https://github.com/phalcon/php-zephir-parser/compare/v1.3.5...v1.3.6