Update changelog (#2321)

Author: wintersteiger

CHANGELOG.md

@@ -5,11 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## [0.19.1]
 
 ### Added
 
 - Historical point query support has been added to JavaScript endpoints (#2285).
+- RSA key generation JavaScript endpoint (#2293).
 
 ### Changed
 
@@ -738,6 +739,7 @@ Some discrepancies with the TR remain, and are being tracked under https://githu
 
 Initial pre-release
 
+[0.19.1]: https://github.com/microsoft/CCF/releases/tag/ccf-0.19.1
 [0.19.0]: https://github.com/microsoft/CCF/releases/tag/ccf-0.19.0
 [0.18.5]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.5
 [0.18.4]: https://github.com/microsoft/CCF/releases/tag/ccf-0.18.4