Added changelog.md.

Signed-off-by: Pavel Erokhin (MairwunNx) <[email protected]>

Author: MairwunNx

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]
+
+## [1.14.4-1.0.2.0] - 2020-01-15
+
+### Added
+- CurseForge link in `/cooldown about` command.
+- German translations by [@BixelPitch](https://github.com/BixelPitch)
+- `noinspections` in [build.gradle](./build.gradle) file. 
+
+### Changed
+- Updated essentials core dependency.
+- Simplified cooldown commands (from `/essentials cooldown` to `/cooldown`).
+- Now cooldown module not depends on Permissions module.
+- Debug information now prints in debug log, not info.
+- Usings optimal `JsonConfiguration` from core module.
+- Simplified code for creating directory.
+- Updated changelog in [update.json](./update.json).
+- Updated Permissions module dependency.
+- Updated gradle wrapper to `5.6.4`.
+- [build.gradle](./build.gradle) file cleanup.
+
+### Removed
+- Redundant information logging.
+- Java plugin from build script.
+- Permissions from mandatory dependencies.
+
+### Fixed
+- Package name. (**Break compatibility**)
+
+## [1.14.4-1.0.1.0] - 2019-10-12
+
+### Fixed
+- Fixed bug with not synchronizing cooldowns for command and command aliases.
+
+## [1.14.4-1.0.0.0] - 2019-10-11
+
+### Added
+- Initial release.