Remove unrelease line from changelog

Author: mroote

CHANGELOG.md

@@ -3,8 +3,6 @@ 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/).
 
-## [Unreleased]
-
 ## [0.10.0] - 2021-02-10
 ### Added
 - Config files can be defined with absolute paths. - Thanks to @FoxAmes