style: reformat changelogs as per Keep a Changelog

Author: naveensingh

CHANGELOG.md

@@ -1,28 +1,40 @@
-Changelog
-==========
+# Changelog
 
-Version 1.0.3 *(2025-03-19)*
-----------------------------
+All notable changes to this project will be documented in this file.
 
-* Changed package name, re-installation is required
-* Added more translations
+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).
 
-Version 1.0.2 *(2024-10-20)*
-----------------------------
+## [Unreleased]
 
-* Update themed/monochrome app icon
-* Bump minimum target Android version to 8
-* Replace checkboxes with material switches
-* Other minor fixes and improvements
-* Added new translations
+## [1.0.3] - 2025-03-19
 
-Version 1.0.1 *(2024-07-24)*
-----------------------------
+### Changed
+- Changed package name, re-installation is required
+- Added more translations
 
-* Added new translations.
+## [1.0.2] - 2024-10-20
 
-Version 1.0.0 *(2024-07-23)*
-----------------------------
+### Changed
+- Update themed/monochrome app icon
+- Bump minimum target Android version to 8
+- Replace checkboxes with material switches
+- Other minor fixes and improvements
+- Added new translations
 
-* Initial release
+## [1.0.1] - 2024-07-24
+
+### Changed
+- Added new translations.
+
+## [1.0.0] - 2024-07-23
+
+### Added
+- Initial release
+
+[Unreleased]: https://github.com/FossifyOrg/Calculator/compare/1.0.3...HEAD
+[1.0.3]: https://github.com/FossifyOrg/Calculator/compare/1.0.2...1.0.3
+[1.0.2]: https://github.com/FossifyOrg/Calculator/compare/1.0.1...1.0.2
+[1.0.1]: https://github.com/FossifyOrg/Calculator/compare/1.0.0...1.0.1
+[1.0.0]: https://github.com/FossifyOrg/Calculator/releases/tag/1.0.0