Add changelog

Fixes #3

CHANGELOG.md

@@ -0,0 +1,49 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/) and this
+project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Breaking
+
+### Changed
+
+### Added
+
+* Add `prefer-to-be-null` rule
+  ([#10](https://github.com/jest-community/eslint-plugin-jest/pull/10))
+* Add `prefer-to-be-undefined` rule
+  ([#9](https://github.com/jest-community/eslint-plugin-jest/pull/9))
+
+## [21.3.2] - 2017-11-09
+
+### Changed
+
+* Fix `prefer-to-have-length` when there are no argument properties
+  ([#6](https://github.com/jest-community/eslint-plugin-jest/pull/6))
+
+## [21.3.1] - 2017-11-09
+
+### Changed
+
+* Remove trailing commas from source code
+
+## [21.3.0] - 2017-11-09
+
+### Added
+
+* Add `prefer-to-have-length` rule
+  ([#4771](https://github.com/facebook/jest/pull/4771))
+
+## [21.2.0] - 2017-09-26
+
+Initial fork from the Jest repo
+
+[unreleased]: https://github.com/siimon/prom-client/compare/v21.3.2...HEAD
+[21.3.2]: https://github.com/siimon/prom-client/compare/v21.3.1...v21.3.2
+[21.3.1]: https://github.com/siimon/prom-client/compare/v21.3.0...v21.3.1
+[21.3.0]: https://github.com/siimon/prom-client/compare/b38a897f164e91fc78ab166529e031d76fc5ca70...v21.3.0
+[21.2.0]: https://github.com/jest-community/eslint-plugin-jest/commit/b38a897f164e91fc78ab166529e031d76fc5ca70