Update README.md

Author: jrvansuita

README.md

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+[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-CheckNewAppVersionAvailable-green.svg?style=true)](https://android-arsenal.com/details/1/4573)
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 # CheckNewAppVersionAvailable
 This class makes a request to Play Store to check if there is a new version of your published app. Then, you can notify your users to do the update.