Added android-arsenal badge

Author: ravidsrk

README.md

@@ -1,4 +1,4 @@
-# Android Testing Guide [![Backers on Open Collective](https://opencollective.com/android-testing-guide/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/android-testing-guide/sponsors/badge.svg)](#sponsors) [![Join the chat at https://gitter.im/android-testing-guide/Lobby](https://badges.gitter.im/android-testing-guide/Lobby.svg)](https://gitter.im/android-testing-guide/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+# Android Testing Guide [![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-Android%20Testing%20Guide-brightgreen.svg?style=flat)](https://android-arsenal.com/details/3/6473) [![Backers on Open Collective](https://opencollective.com/android-testing-guide/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/android-testing-guide/sponsors/badge.svg)](#sponsors) [![Join the chat at https://gitter.im/android-testing-guide/Lobby](https://badges.gitter.im/android-testing-guide/Lobby.svg)](https://gitter.im/android-testing-guide/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
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