Added changelog

Author: parnic

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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.1.0](https://github.com/parnic/MMM-Unsplash/releases/tag/v1.1.0) - 2019-01-07
+### Added
+- Support for specifying the image div ID to allow multiple Unsplash modules to be loaded at once (issue #1).
+
+## [1.0.0](https://github.com/parnic/MMM-Unsplash/releases/tag/v1.0.0) - 2018-04-25
+- Initial release