Add changelog

Author: Sieg

CHANGELOG.md

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+# Change Log for Array Validator component
+
+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]
+
+...
+
+## [v1.0.0] - 2018-05-24
+
+Tested for a while, stable version.
+
+Implemented rules:
+* Required
+* Expression
+* Equals
+* Callback
+* Length
+* Filter
+
+See README.md for more information.
+
+[Unreleased]: https://github.com/Sieg/array-validator/compare/v1.0.0...HEAD
+[v1.0.0]: https://github.com/Sieg/array-validator/compare/3778b8fe...v1.0.0