Add changelog

Author: gulachek

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.4]
+
+### Added
+
+- Added `catui_semver_to_string` function to serialize semver versions
+- Added `catui_semver_from_string` function to parse semver versions
+- Added `catui_semver_can_support` and `catui_semver_can_use` to test semver version compatibility
+- Started tracking changes in `CHANGELOG.md`
+
+[0.1.4]: https://github.com/gulachek/catui/compare/v0.1.3...v0.1.4