style: change changelog

CHANGELOG.md

@@ -1,22 +1,23 @@
 # CHANGELOG
-## v1.2.2 (2018-09-07)
 
-* fix: remove a bug in dnssec cron
+This project adheres to [Semantic Versioning](http://semver.org/).
+Which is based on [Keep A Changelog](http://keepachangelog.com/)
+
+## [Unreleased]
+
+## v1.2.2 (2018-09-07)
+- fix: remove a bug in dnssec cron
 
 ## v1.2.1 (2018-08-08)
-
-* fix: add dnssec cron
+- fix: add dnssec cron
 
 ## v1.2.0 (2018-07-09)
-
-* feat: add bind_zones_subnet for extra-vars 
-* fix: disable allow transfer if isn't set
+- feat: add bind_zones_subnet for extra-vars 
+- fix: disable allow transfer if isn't set
 
 ## v1.1.0 (2018-03-31)
-
-* feat: remove old zone files
-* feat: test the playbook with ansible 2.5
+- feat: remove old zone files
+- feat: test the playbook with ansible 2.5
 
 ## v1.0.0 (2018-03-21)
-
-* first version
+- first version