Introduce CHANGELOG.md

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
+### Removed
+
+## [4.3.1] - 2020-04-21
+### Added
+### Changed
+- Fixed included compiler binary file, which was broken due to incorrect local system dependencies.
+  Because the aesophia version hasn't changed, the compiler in this release
+  continues to report as `v4.3.0`.
+### Removed
+
+## [1.1.0] - 2020-09-24
+### Added
+Include [Cacaphony](https://github.com/centromere/cacophony) test vectors.
+### Changed
+Updated `enacl` to version [1.1.1](https://github.com/jlouis/enacl/releases/tag/v1.1.1).
+Fixed some imprecise type specifications.
+### Removed
+
+## [1.0.1] - 2018-12-21
+### Added
+### Changed
+Improved argument checks and error handling in handshake (in particular related to empty
+hand shake messages).
+### Removed
+
+## [1.0] - 2018-10-09
+Initial version the following map describe what is supported:
+```
+#{ hs_pattern => [nn, kn, nk, kk, nx, kx, xn, in, xk, ik, xx, ix]
+ , hash       => [blake2b, sha256, sha512]
+ , cipher     => ['ChaChaPoly', 'AESGCM']
+ , dh         => [dh25519] }
+```
+
+[Unreleased]: https://github.com/aeternity/aesophia_cli/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/aeternity/aesophia_cli/compare/v1.0.1...v1.1.0
+[1.0.1]: https://github.com/aeternity/aesophia_cli/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/aeternity/enoise/releases/tag/v1.0.0