add cron tag

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).
+
+## [1.0.2] - 2021-04-20
+
+### Added
+
+- Add the `cron` tag to backup to backups made with cron.
+
+### Fixed
+
+- Don't unlock lockfile if process is already running.
+
+## [1.0.1] - 2021-04-17
+
+### Added
+
+- Completion command for various shells
+
+## [1.0.0] - 2021-04-17
+
+- Rewrite in go. See https://autorestic.vercel.app/upgrade for migration.