Update README.md

Author: corneliusyaovi

README.md

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 # Flutterwave v3 PHP SDK
 
-[![Latest Stable Version](https://poser.pugx.org/flutterwave/flutterwave-v3/v1.0.0)](https://packagist.org/packages/flutterwavedev/flutterwave-v3)
-[![License](https://poser.pugx.org/flutterwave/flutterwave-v3/license)](https://packagist.org/packages/flutterwavedev/flutterwave-v3)
+![Packagist License](https://img.shields.io/packagist/l/flutterwavedev/flutterwave-v3?style=flat-square)
 
 Use this library to integrate your PHP app to Rave.