add CHANGELOG.md

Author: kortirso

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]
+### Added
+- CHANGELOG.md file
+
+## [0.1.1] - 2018-11-19
+### Added
+- Gaussian Naive Bayes algorithm
+- Math module with useful operations
+
+## [0.1.0] - 2018-11-15
+### Added
+- K-Nearest Neighbours algorithm