Update changelog

CHANGELOG.md

+
+<a name="v1.2.0"></a>
+## [v1.2.0] - 2022-09-18
+### Changes
+- chore add git-chglog tool and update makefile
+
+
 <a name="v1.1.0"></a>
 ## [v1.1.0] - 2022-09-18
 ### Changes
@@ -13,5 +20,6 @@
 <a name="v1.0.0"></a>
 ## v1.0.0 - 2022-09-18
 
+[v1.2.0]: https://gitlab.schukai.com/oss/libraries/go/application/configuration/compare/v1.1.0...v1.2.0
 [v1.1.0]: https://gitlab.schukai.com/oss/libraries/go/application/configuration/compare/v1.0.1...v1.1.0
 [v1.0.1]: https://gitlab.schukai.com/oss/libraries/go/application/configuration/compare/v1.0.0...v1.0.1