Preparing 0.19.0 release

Author: vytautas-karpavicius

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]
+
+## [v0.19.0] - 2022-01-05
 ### Added
 - Added JWT Authorization Provider. This change includes a dependency that uses v2+ go modules. They no longer match import paths, meaning that we have to **drop support for dep & glide** in order to use this. [#1116](https://github.com/uber-go/cadence-client/pull/1116)
 ### Changed