Prepare release 3.0.1 (#55)

Author: Nyholm

CHANGELOG.md

@@ -7,6 +7,10 @@ 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).
 
 
+## [3.0.1] - 2021-03-21
+
+- Allow to be installed with Guzzle PSR-7 2.0
+
 ## [3.0.0] - 2020-10-01
 
 - Only support HTTPlug 2.0 and PSR-18