Fix the minumum version of iOS/tvOS

Author: lizhuoli

Diff for: Package.swift

@@ -5,7 +5,7 @@ import PackageDescription
 let package = Package(
     name: "SDWebImageSVGKitPlugin",
     platforms: [
-        .macOS(.v10_11), .iOS(.v13), .tvOS(.v13)
+        .macOS(.v10_11), .iOS(.v9), .tvOS(.v9)
     ],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.