Add CHANGELOG.md

Author: francescobianco

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [v0.1.8](https://github.com/javanile/php-imap2/compare/0.1.8...0.1.7) - 2022-09-05
+
+### Changed
+
+- New reopen error message ([#3](https://github.com/javanile/php-imap2/issues/3))
+
+### Fixed
+
+- Fixed reopen functions ([#3](https://github.com/javanile/php-imap2/issues/3))
+
+
+
+## [v0.1.7](https://github.com/javanile/php-imap2/compare/0.1.7...0.1.0) - 2022-01-01
+
+### Changed
+ 
+- Documentation amends ([#3](https://github.com/javanile/php-imap2/issues/3)) 
+
+### Fixed
+
+- Documentation amends ([#3](https://github.com/javanile/php-imap2/issues/3))