Implement a basic Changelog; fixes #107

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/).
+
+This project follows the official Firefox releases, but also uses
+[Arch Linux Package Versioning](https://wiki.archlinux.org/index.php/Arch_package_guidelines#Package_versioning) to mark individual releases in between versions.
+
+## [Unreleased]
+
+## [74.0-2] - 2020-03-10
+
+### Fixed
+
+- Wrong commenting format in `librewolf.cfg` breaking LibreWolf settings
+
+### Known Issues
+
+- Appimage and FlatPak releases must be considered broken
+
+## [74.0-1] - 2020-03-10
+
+### Added
+
+- Initial release following stable upstream Firefox releases
+- [WIP] Appimage and FlatPak Releases