docs(changelog): add message to change log, bump npm version

Author: harshithkashyap

CHANGELOG.md

@@ -62,6 +62,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
    - `deep-extend` from `0.4.2` to `0.5.1`
    - `randomatic` from `1.1.7` to `3.1.0`
 
+## [1.0.0]
+### Changed
+- Update DirectLine to rxjs v6 pipeable operators
+
 ## [0.9.17] - 2018-08-31
 ### Changed
 - Add handling of 403/500 for `getSessionId`, in [#87](https://github.com/Microsoft/BotFramework-DirectLineJS/pull/87)