update changelog/version

Author: dropwhile

CHANGELOG.adoc

@@ -18,6 +18,8 @@ toc::[]
 :link-proxy-from-env: https://golang.org/pkg/net/http/#ProxyFromEnvironment
 
 == HEAD
+
+== v2.3.0 - 2021-10-20
 *   Add support for listening on a unix socket.
 *   A more graceful shutdown process, under SIGINT or SIGTERM.