Update README.md

Author: gre4ixin

README.md

@@ -1,7 +1,8 @@
 # AsyncLocationKit
 
 [![Swift Package Manager](https://img.shields.io/badge/Swift_Package_Manager-compatible-orange?style=flat)](https://img.shields.io/badge/Swift_Package_Manager-compatible-orange?style=flat)
-[![Swift](https://img.shields.io/badge/Swift-5.5-orange?style=flat)](https://img.shields.io/badge/Swift-5.3_5.4_5.5-Orange?style=flat)
+[![Swift](https://img.shields.io/badge/Swift-5.5-orange?style=flat)](https://img.shields.io/badge/Swift-5.5-Orange?style=flat)
+[![Platforms](https://img.shields.io/badge/iOS-13-green?style=flat)](https://img.shields.io/badge/iOS-13-Orange?style=flat)
 
 Wrapper for Apple `CoreLocation` framework with new Concurency Model. No more `delegate` patter or `completion blocks`.