Update README.md

yuyakaido · web-flow · commit c421643f4f8d · 2017-09-16T18:24:50.000+09:00
diff --git a/README.md b/README.md
@@ -2,6 +2,7 @@
 
 # CardStackView
 
+![Platform](http://img.shields.io/badge/platform-android-blue.svg?style=flat)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![API](https://img.shields.io/badge/API-14%2B-blue.svg?style=flat)](https://android-arsenal.com/api?level=14)
 [![Download](https://api.bintray.com/packages/yuyakaido/maven/CardStackView/images/download.svg)](https://bintray.com/yuyakaido/maven/CardStackView/_latestVersion)
