About time we had a changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+- Configuration moved from command line to an app-managed YAML file
+
+## [v0.4.0] - 2021-09-26
+
+- Moved to semantic versioning
+- Automatic version check, prompts for upgrade in GUI
+- Fixed regex to properly match "merging" lines
+- Automatically refresh index page
+
+## [0.03] - 2021-09-24
+
+- Add option to change command (to use youtube-dlc or other forks) and command line arguments
+- Improve log display in popup
+- Improve documentation (slightly)
+
+## [0.02] - 2021-09-22
+
+- Fix #4 so that deleted files are removed from the results
+
+## [0.01] - 2021-09-22
+
+- Initial release