Update changelog for 0.19.1 (#486)

Author: Matt

CHANGELOG.md

@@ -4,6 +4,10 @@ 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/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.19.1] - 2021-06-23
+
+- Update to FCS 40 [@baronfel]
+
 ## [0.19.0] - 2021-06-12
 
 - Update to FCS 39 [@baronfel]