added a changelog

Author: oscarotero

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/) 
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## 2.1.0 - 2018-06-12
+
+### Added
+
+- Allow to include the plural function in the translations to prevent CSP errors [#4]
+
+[#4]: https://github.com/oscarotero/gettext-translator/issues/4
+