update changelog

Author: chriddyp

Diff for: CHANGELOG.md

@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - Moved `PropTypes` import from using `react` to using `prop-types` package to support using React 16+ in `dash-renderer`
 
+### Added
+- Added `Picture` and `Base` components
+- Added `muted` property to `Audio` component
+
 ## [0.8.0] - 2017-09-29
 ### Added
 - A `key` property has been added to every component. See https://reactjs.org/docs/lists-and-keys.html for more about this attribute.