Added changelog

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).
+
+## [Unreleased]
+- uses pyexiv2 which is also able to tag various camera raw formats, e. g. CR2
+- removed unnecessary datetime object creation as pyexiv2 can output datetime objects
+
+## [0.2] - ??????
+### Added
+
+
+## [0.1] - 2020-02-02
+First prototype using piexif
+
+### Added
+- argument parsing enabled
+- parametrized factor to calculate Sieverts
+- parametrized output dir
+- usage of os.path to be os-aware
+- output in a tablish manner
+
+### Modified
+- exchanged selfmade CSV parser by python's core CSV library