Add changelog

Author: teal77

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]
+
+## [1.3.0-beta] - 2020-09-18
+### Added
+- Add torrents by infohash
+- Trackers list in torrent details > options > trackers
+- Add, delete and edit trackers in trackers list
+
+### Fixed
+- Simplified torrent delete confirmation dialog
+- A bug where selcting 'No Label' filter and then opening, closing filter sheet without changing anything
+would clear the torrent list until filter is manually changed again.
+