Release 0.12.0 (#326)

Author: yngvar-antonsson

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]
+
+## [0.12.0] - 2021-11-18
 ### Changed
 - Update `http` dependency to 1.1.1