update changelog

Author: izolate

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).
 
+## [4.0.1] - 2022-07-23
+### Fixed
+- Error converting a nullish value to string (undefined, null)
+
 ## [4.0.0] - 2021-05-19
 ### Fixed
 - Bug causing "1000T" instead of "1M" (#25)