Add CHANGELOG.md

Signed-off-by: Sora Morimoto <[email protected]>

Author: smorimoto

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]
+
+### Changed
+
+Windows installs `mingw64-x86_64-gcc-g++` so GitHub Action can build libraries
+that require it.
+
+## [1.1.3] - 2020-10-23 [YANKED]
+
+### Security
+
+- Update the `@actions/core` package to address CVE-2020-15228.
+
+## [1.1.2] - 2020-09-10
+
+### Changed
+
+- Add the Cygwin setup to a known location for later steps.
+
+### Fixed
+
+- Check if the switch exists before creating the switch.
+
+## [1.1.1] - 2020-08-20
+
+### Fixed
+
+- OCaml installation errors on Windows are now properly propagated.
+
+## [1.1.0] - 2020-07-04
+
+### Added
+
+- The default opam repository can now be set via input.
+
+### Changed
+
+- Linux VMs now use opam 2.0.7.
+
+## [1.0.1] - 2020-04-21
+
+### Changed
+
+- `node_modules` are not exported anymore which reduces the size of the action
+
+- The repository is initialised directly from the opam-repository git source, so
+  that there is no lag in packages being available for CI
+
+- Ubuntu installs `musl-tools` so that the GitHub Action can generate statically
+  linked Linux binaries in conjunction with the
+  `ocaml-variants.4.x.y+musl+flambda` switch
+
+## [1.0] - 2019-11-21
+
+- Initial release.