Update Changelog for release of version 2.3.0

Author: LaunchDarklyCI

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to the LaunchDarkly Ruby SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [2.3.0] - 2017-11-16
+## Added
+- Add `close` method to Ruby client to stop processing events
+- Add support for Redis feature store
+- Add support for LDD mode
+- Allow user to disable outgoing event stream.
+
+## Changed
+- Stop retrying on 401 responses (due to bad sdk keys)
+
 ## [2.2.7] - 2017-07-26
 ## Changed
 - Update Readme to fix instructions on installing gem using command line