Added changelog

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](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.0] - 2023-04-25
+
+### Added
+
+- Added PHPStan on level 8
+- Added GitHub actions - PHPStan, Php-Cs-Fixer and Docker image build
+- Added the option `--append`. All entries from Toggl are synchronized without creating a diff if the mode `--append` is enabled. Will cause duplicates if the command is run multiple times for the same day.
+
+### Changed
+
+- Changed coding style (new Php-Cs-Fixer configuration).
+
+### Fixed
+
+- Fixed duplicated descriptions in the `--group-by-day` mode.
+- Entries from Toggl that are the same as entries from JIRA (same start date and same duration) are only listed in the diff table, but they are not updated.
+
+## [1.0.0] - 2022-08-29
+
+Initial release.
+
+[unreleased]: https://github.com/68publishers/toggl-to-jira/compare/v1.1.0...main
+[1.1.0]: https://github.com/68publishers/toggl-to-jira/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/68publishers/toggl-to-jira/commits/v1.0.0