changelog updated

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2023-09-15
+### Fixed
+- default license added for old entries
+
 ## [1.3.0] - 2023-09-15
 ### Improvement
 - minerva project can have license attached (#14)