docs: keep a changelog

Author: JCMais

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]
+
+### Breaking Change
+
+### Fixed
+
+### Added
+
+### Changed
+
+## [Unreleased]
+
+### Breaking Change
+
+### Fixed
+
+- Use GraphQL `extensions` when available.
+- Support GraphQL v15
+
+### Added
+
+### Changed
+
+## [0.0.1] - 2018-09-06
+
+### First version
+
+[unreleased]: https://github.com/JCMais/graphql-yup-middleware/compare/master...HEAD