add 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]
+
+## [1.1.1] - 2019-11-02
+
+### Added
+
+- Version label and link to gitlab repo to sidebar
+
+### Changed
+
+- Cleaned up UI
+- Recording is now done through `MediaRecorder` API instead of `ccapture.js` - less dependencies, works on firefox
+
+## [1.1.0] - 2019-11-01
+
+### Added
+
+- Loop & fullscreen button
+- Discarding / filtering out partial frames
+- Slices can have an offset from origin
+- Slice size and offset can be set by clicking on canvas
+
+## [1.0.0] - 2018-02-26
+
+Initial version. Supports recording, basic slitscan functionality.
+
+[unreleased]: https://gitlab.com/tmladek/slitscan/compare/v1.1.1...master
+[1.1.1]: https://gitlab.com/tmladek/slitscan/compare/v1.1.0...v1.1.1
+[1.1.0]: https://gitlab.com/tmladek/slitscan/compare/v1.0.0...v1.1.0
+[1.0.0]: https://gitlab.com/tmladek/slitscan/-/tags/v1.0.0