Add changelog document

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
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [0.42.0] - 2021-01-12
+
+### Added
+
+- Support for websockets.
+
+## [0.41.1] - 2021-01-07
+
+### Changed
+
+Updated `argon2-webworker` dependency.
+
+## [0.41.0] - 2021-01-07
+
+Details missing.
+
+## [0.40.1] - 2020-11-17
+
+Details missing.
+
+## [0.40.0] - 2020-11-11
+
+Details missing.
+
+## [0.30.0] - 2020-11-03
+
+Details missing.
+
+## [0.21.0] - 2020-10-23
+
+Details missing.
+
+## [0.20.0] - 2020-10-15
+
+Details missing.
+
+## [0.14.0] - 2020-10-13
+
+Details missing.
+
+## [0.13.2] - 2020-10-09
+
+Details missing.
+
+## [0.13.1] - 2020-09-29
+
+Details missing.
+
+## [0.13.0] - 2020-09-19
+
+Details missing.
+
+## [0.12.0] - 2020-09-16
+
+Details missing.
+
+## [0.11.0] - 2020-09-07
+
+Details missing.
+
+## [0.10.4] - 2020-09-02
+
+Details missing.
+
+## [0.10.3] - 2020-09-02
+
+Details missing.
+
+## [0.10.2] - 2020-09-02
+
+Details missing.
+
+## [0.10.1] - 2020-09-01
+
+Details missing.
+
+## [0.10.0] - 2020-09-01
+
+Details missing.
+
+## [0.9.5] - 2020-08-31
+
+Details missing.
+
+## [0.9.4] - 2020-08-18
+
+Details missing.
+
+## [0.9.3] - 2020-08-13
+
+Details missing.
+
+## [0.9.2] - 2020-08-10
+
+Details missing.
+
+## [0.9.1] - 2020-08-10
+
+Details missing.
+
+## [0.9.0] - 2020-08-07
+
+Details missing.
+
+## [0.8.0] - 2020-08-07
+
+Details missing.
+
+## [0.7.4] - 2020-08-06
+
+Details missing.
+
+## [0.7.3] - 2020-08-05
+
+Details missing.
+
+## [0.7.2] - 2020-08-05
+
+Details missing.
+
+## [0.7.1] - 2020-08-05
+
+Details missing.
+
+## [0.7.0] - 2020-08-03
+
+Details missing.
+
+## [0.6.1] - 2020-08-02
+
+Details missing.
+
+## [0.6.0] - 2020-07-30
+
+Details missing.
+
+## [0.5.0] - 2020-07-25
+
+Details missing.
+
+## [0.4.0] - 2020-07-23
+
+Details missing.
+
+## [0.3.1] - 2020-07-22
+
+Details missing.
+
+## [0.3.0] - 2020-07-22
+
+Details missing.
+
+## [0.2.0] - 2020-07-19
+
+Details missing.
+
+## [0.1.5] - 2020-07-16
+
+Details missing.
+
+## [0.1.4] - 2020-07-15
+
+Details missing.
+
+## [0.1.3] - 2020-07-08
+
+Details missing.
+
+## [0.1.2] - 2020-07-06
+
+Details missing.
+
+## [0.1.1] - 2020-06-29
+
+Details missing.
+
+## [0.1.0-beta.6] - 2020-06-29
+
+Details missing.
+
+## [0.1.0-beta.5] - 2020-06-29
+
+Details missing.
+
+## [0.1.0-beta.4] - 2020-06-29
+
+Details missing.
+
+## [0.1.0-beta.3] - 2020-06-28
+
+Details missing.
+
+## [0.1.0-beta.2] - 2020-06-28
+
+Details missing.
+
+## [0.1.0-beta.1] - 2020-06-25
+
+Details missing.
+
+## [0.1.0-beta.0] - 2020-06-25
+
+Details missing.
+
+## [0.1.0] - 2020-03-13
+
+Details missing.