Update for Swift 4

Author: aciidgh

Diff for: Package.swift

@@ -1,3 +1,6 @@
+// swift-tools-version:4.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
 /*
  This source file is part of the Swift.org open source project
 
@@ -11,5 +14,16 @@
 import PackageDescription
 
 let package = Package(
-    name: "PlayingCard"
+    name: "PlayingCard",
+    products: [
+        .library(name: "PlayingCard", targets: ["PlayingCard"]),
+    ],
+    targets: [
+        .target(
+            name: "PlayingCard",
+            dependencies: []),
+        .testTarget(
+            name: "PlayingCardTests",
+            dependencies: ["PlayingCard"]),
+    ]
 )

Diff for: README.md

@@ -2,8 +2,7 @@ This example package will be cloned and built as a dependency if you build the `
 
     git clone https://github.com/apple/example-package-dealer.git
     cd example-package-dealer
-    swift build
-    .build/debug/Dealer
+    swift run Dealer
 
 # License