changelog for Graph cleanup #604

Author: alexcjohnson

CHANGELOG.md

@@ -2,6 +2,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## UNRELEASED
+### Fixed
+- Fixed problems with `Graph` components leaking events and being recreated multiple times if declared with no ID [#604](https://github.com/plotly/dash-core-components/pull/604)
+
 ## [1.1.1] - 2019-08-06
 - Upgraded plotly.js to 1.49.1 [#595](https://github.com/plotly/dash-core-components/issues/595)
 - Patch release [1.49.1](https://github.com/plotly/plotly.js/releases/tag/v1.49.1)