Update Package.swift

Author: s4cha

Package.swift

@@ -5,7 +5,7 @@ import PackageDescription
 
 let package = Package(
     name: "Networking",
-    platforms: [.iOS(.v13), .macOS(SupportedPlatform.MacOSVersion.v10_15)],
+    platforms: [.iOS(.v13), .macOS(.v10_15)],
     products: [.library(name: "Networking", targets: ["Networking"])],
     targets: [
         .target(name: "Networking"),