added changelog

CHANGELOG.md

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+# Changelog for invites-common-livrary
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v1.5.1-SNAPSHOT] - 2020-07-21
+
+Ported to git
+
+## [v1.5.0] - 2017-11-29
+
+Invite method revised to avoid double step in case of user registration
+
+Invite emails are now sent via Email Templates Library
+
+removed ASL Session, ported to gCube Client Context
+
+## [v1.1.0] - 2016-07-30
+
+Update for Liferay 6.2.5
+
+## [v1.0.0] - 2015-06-30
+
+First release