update README

CHANGELOG.md

@@ -0,0 +1,21 @@
+Changelog
+---------
+
+**2.0.0**
+
+- use correct semantic versioning as described in https://semver.org. Needed for Ansible Galaxy importer as it now insists on using semantic versioning.
+- moved changelog entries to separate file
+- make Ansible linter happy
+- no major changes but decided to start a new major release as versioning scheme changed quite heavily
+
+**v1.0.2**
+
+- update README
+
+**v1.0.1**
+
+- update README
+
+**v1.0.0**
+
+- initial implementation

README.md

@@ -22,18 +22,7 @@ By default port `51820` (protocol UDP) should be accessable from the outside. Bu
 Changelog
 ---------
 
-**v1.0.2**
-
-- update README
-
-**v1.0.1**
-
-- update README
-
-**v1.0.0**
-
-- initial implementation
-
+see [CHANGELOG.md](https://github.com/githubixx/ansible-role-wireguard/blob/master/CHANGELOG.md)
 
 Role Variables
 --------------