revert part valid trait

Author: tabuna

CHANGELOG.md

@@ -4,11 +4,6 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## 9.10.0 - 2020-11-21
-
-### Added
-- Trait for taking a part of valid data
-
 ## 9.9.2 - 2020-11-20
 
 ### Fixed