Add changelog

Author: AydinHassan

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [Unreleased][unreleased]
+### Added
+
+### Changed
+
+### Fixed
+
+### Removed
+
+## [1.1.0]
+### Fixed
+ - Added tests for ResultRendererFactory and fixed the interface validation (#126)
+   
+### Changed
+ - Improved message when a solution fails (#129)  
+ 
+### Added
+ - Added feature to put workshop in tutorial mode where exercises must be completed one after another (#127)
+ - Updated dependencies (5d16877)