Add a Changelog

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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- New `transpile` command to replace some functionality of devel server
+
+### Changed
+- Major rewrite/refactor of `mothd`
+- `state/until` is now `state/hours` and can specify multiple begin/end hours
+- `state/disabled` is now `state/enabled`
+- Mothball structure has changed substantially
+
+### Deprecated
+
+### Removed
+- Development server is gone now; use `mothd` directly with a flag to transpile on the fly
+
+### Fixed
+
+### Security
+