Add changelog

CHANGELOG.md

@@ -0,0 +1,20 @@
+# 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]
+
+### Added
+- Support for concurrent downloads
+- Support for proper config files
+- This changelog
+
+### Changed
+- Rewrote almost everything
+- Redesigned CLI
+
+### Removed
+- Backwards compatibility with 2.x

README.md

@@ -4,6 +4,7 @@
 
 Other resources:
 
+- [Changelog](CHANGELOG.md)
 - [Development Guide](DEV.md)
 
 ## Installation with pip