Added badge of Android Arsenal

yuyakaido · web-flow · commit 12e58cddeea2 · 2017-08-21T00:42:09.000+09:00
diff --git a/README.md b/README.md
@@ -5,6 +5,7 @@
 [![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)
+[![AndroidArsenal](https://img.shields.io/badge/Android%20Arsenal-CardStackView-blue.svg?style=flat)](https://android-arsenal.com/details/1/6075)
 [![CircleCI](https://circleci.com/gh/yuyakaido/CardStackView.svg?style=svg)](https://circleci.com/gh/yuyakaido/CardStackView)
 
 # Overview
