Add a changelog

Author: laserlemon

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [2.1.0] - 2025-06-30
+
+### Added
+
+- Support for Ruby versions 3.3 and 3.4
+- InsecureRandom.disabled? method
+- InsecureRandom.disable method
+
+### Changed
+
+- Refreshed development dependency version requirements
+
+### Fixed
+
+- Bug where InsecureRandom.enable disabled afterward, even when not originally disabled
+
+## [2.0.0] - 2024-04-13
+
+### Added
+
+- Support for Ruby versions 3.0, 3.1, and 3.2
+- Ability to enable and disable repeatability
+- RuboCop style linting
+
+## [1.0.0] - 2013-05-03
+
+Initial release!
+
+[unreleased]: https://github.com/laserlemon/insecure_random/compare/v2.1.0...HEAD
+[2.1.0]: https://github.com/laserlemon/insecure_random/compare/v2.0.0...v2.1.0
+[2.0.0]: https://github.com/laserlemon/insecure_random/compare/v1.0.0...v2.0.0
+[1.0.0]: https://github.com/laserlemon/insecure_random/commits/v1.0.0