add release notes for 15.0.1

CHANGELOG.md

@@ -4,15 +4,22 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [15.0.1] - 2017-10-23
+
+### Fixed
+
+- header: fix subtitle white space wrap and overflow
+- expansion panel: remove extra div
+
 ## [15.0.0] - 2017-10-06
 
-## Changed
+### Changed
 
 - transpile code in `es/` folder to make `create-react-app` `npm run build` work
 - use `react-transition-group` for snackbar to be able to remove from DOM when invisible. fixes overflow scroll in safari.
 - use unitless value for `line-height` in `base.css` to fix box sizing issues
 
-## Added
+### Added
 
 - add new component expansion panel