Update CHANGELOG.md

Author: shalvah

CHANGELOG.md

@@ -13,6 +13,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 
+## [4.2.1] - Monday, 20 January 2020
+### Fixed
+- Fixed autogenerated docs endpoint address for Postman collection (https://github.com/mpociot/laravel-apidoc-generator/pull/673)
 
 ## [4.2.0] - Sunday, 19 January 2020
 ### Added