Add changelog (a.k.a. Hall of Fame)

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## 0.1.2 (2018-05-01)
+
+- [PR [#1](https://github.com/Envek/after_commit_everywhere/pull/1)] Enable ActiveRecord 4.2 support. ([@arjun810], [@Envek])
+
+## 0.1.1 (2018-03-29)
+
+- Do not issue warning on `after_commit` invocation outside of transaction as it is expected behaviour. ([@Envek])
+
+## 0.1.0 (2018-03-18)
+
+- Initial version with `after_commit`, `before_commit`. and `after_rollback` callbacks. ([@Envek])
+
+[@Envek]: https://github.com/Envek "Andrey Novikov"
+[@arjun810]: https://github.com/arjun810 "Arjun Singh"