Merge pull request #1260 from material-components:release-v0.15.0

PiperOrigin-RevId: 310034241

Author: copybara-github

CHANGELOG.md

@@ -4,7 +4,8 @@ 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/).
 
-## Unreleased
+<!-- ## Unreleased -->
+## [v0.15.0] - 2020-05-05
 
 ### Added