Added changelog

Author: grogy

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/).
+
+## [Unreleased]
+
+### Added
+
+- Added check for Symfony dump function `dd` from [@antograssiot](https://github.com/antograssiot).
+- Added check for Laravel dump function `dump` from [@Douglasdc3](https://github.com/Douglasdc3).
+- Added changelog.
+
+### Internal
+
+- Fixed running tests in PHP 5.4 and PHP 5.5 in CI.