Update README.md

Author: TutorialsAndroid

README.md

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 Alert Dialog ![API](https://img.shields.io/badge/API-15%2B-brightgreen.svg?style=flat)
 ===================
-Alert for Android, a beautiful and material alert dialog
+AlertDialog for Android, a beautiful and material alert dialog to use in your android app.
 
 **Library available at JitPack.io**