Added tvOS as a supported platform (#11)

Author: zac

Package.swift

@@ -6,8 +6,9 @@ import PackageDescription
 let package = Package(
     name: "Endpoints",
     platforms: [
-        .macOS(.v10_15),
         .iOS(.v13),
+        .tvOS(.v13),
+        .macOS(.v10_15),
         .watchOS(.v6)
     ],
     products: [