Add 0.99.4 CHANGELOG (#2518)

Author: eddyashton

CHANGELOG.md

@@ -5,6 +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).
 
+## [0.99.4]
+
+### Fixed
+
+- Fixed use of `--curve-id` argument to `cchost`, which can now start a network with both node and service identities using curve `secp256r1` (#2516).
+
 ## [0.99.3]
 
 ### Added
@@ -817,6 +823,7 @@ Some discrepancies with the TR remain, and are being tracked under https://githu
 
 Initial pre-release
 
+[0.99.4]: https://github.com/microsoft/CCF/releases/tag/ccf-0.99.4
 [0.99.3]: https://github.com/microsoft/CCF/releases/tag/ccf-0.99.3
 [0.99.2]: https://github.com/microsoft/CCF/releases/tag/ccf-0.99.2
 [0.99.1]: https://github.com/microsoft/CCF/releases/tag/ccf-0.99.1