fix: update README to replace popularity badge with downloads badge

README.md

@@ -2,7 +2,7 @@
 
 [![pub package](https://img.shields.io/pub/v/apple_product_name)](https://pub.dev/packages/apple_product_name)
 [![pub points](https://img.shields.io/pub/points/apple_product_name?color=2E8B57&label=pub%20points)](https://pub.dev/packages/apple_product_name/score)
-[![pub popularity](https://img.shields.io/pub/popularity/apple_product_name)](https://pub.dev/packages/apple_product_name/score)
+[![pub downloads](https://img.shields.io/pub/dm/apple_product_name)](https://pub.dev/packages/apple_product_name/score)
 [![flutter ci](https://github.com/kyle-seongwoo-jun/flutter_apple_product_name/actions/workflows/flutter.yml/badge.svg)](https://github.com/kyle-seongwoo-jun/flutter_apple_product_name/actions/workflows/flutter.yml)
 
 Library for translating Apple machine identifiers into Apple product names (e.g. `iPhone17,1` to `iPhone 16 Pro`)