Update CHANGELOG.md for version 1.8.0 release

Author: Jeckerson

CHANGELOG.md

@@ -215,7 +215,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
  - Initial stable release
 
-[Unreleased]: https://github.com/phalcon/php-zephir-parser/compare/v1.6.0...HEAD
+[Unreleased]: https://github.com/phalcon/php-zephir-parser/compare/v1.8.0...HEAD
+[1.8.0]: https://github.com/phalcon/php-zephir-parser/compare/v1.7.0...v1.8.0
+[1.7.0]: https://github.com/phalcon/php-zephir-parser/compare/v1.6.1...v1.7.0
 [1.6.1]: https://github.com/phalcon/php-zephir-parser/compare/v1.6.0...v1.6.1
 [1.6.0]: https://github.com/phalcon/php-zephir-parser/compare/v1.5.3...v1.6.0
 [1.5.3]: https://github.com/phalcon/php-zephir-parser/compare/v1.5.2...v1.5.3