Add CHANGELOG

CHANGELOG.md

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+# Changelog
+
+## Version 1.0
+
+- Due to the switch to the base template feature the minimum required version of Hugo changed to v0.21
+- Support for Google Analytics have been added
+- Hugo's internal Disqus template replaced the custom one of this theme. The Disqus shortname now has to be defined outsite the `[params]` blog