Add CHANGELOG.md for 4.1.0 (last release)

This was missing and sometimes people complain about this ;)

Author: Techcable

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 4.1.0 - 2020-10-21
+### Changed
+
+* Require `slog>=2.4`
+* Require `log>=0.4.11
+
+## Fixed
+
+* Remove unused dependency `crossbeam = 0.7.1`
+
 ## 4.0.0 - 2018-08-13
 ### Changed