release(v0.5.0): add date and version to the changelog

Author: sassman

CHANGELOG.md

@@ -5,6 +5,8 @@ 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).
 
 ## [Unreleased]
+
+## [0.5.0] - 2021-01-24
 ### Added
 - Video output feature: (`--video` or `-m`) now additionally generates a (H.256) `.mp4` file parallel to the `.gif`. [pull/49](https://github.com/sassman/t-rec-rs/pull/49), [issues/45](https://github.com/sassman/t-rec-rs/issues/45), [fd600e0]
 - Release ci pipeline now produces a debian package file and attaches it to the release [7e8ca49]