version of Swift required to build this package. import PackageDescription let package = Package( name: ”SampleLib", platforms: [.iOS(.v11), .watchOS(.v4)], products: [ .library(name: ”SampleLib", targets: [”SampleLib"]), ], dependencies: [ ], targets: [ .target(name: ”SampleLib", dependencies: []), ], swiftLanguageVersions: [.v5] )