Update CHANGELOG.md (#92)

Author: compulim

CHANGELOG.md

@@ -5,6 +5,8 @@ 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]
+
+## [0.9.17] - 2018-08-31
 ### Changed
 - Add handling of 403/500 for `getSessionId`, in [#87](https://github.com/Microsoft/BotFramework-DirectLineJS/pull/87)