[Swift 4] Update Trie

Author: remlostime

Trie/Trie/Trie/Trie.swift

@@ -6,6 +6,11 @@
 //  Copyright © 2016 Rick Zaccone. All rights reserved.
 //
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+    print("Hello, Swift 4!")
+#endif
+
 import Foundation
 
 /// A node in the trie

Trie/Trie/Trie/ViewController.swift

@@ -6,6 +6,11 @@
 //  Copyright © 2016 Rick Zaccone. All rights reserved.
 //
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+    print("Hello, Swift 4!")
+#endif
+
 import Cocoa
 
 class ViewController: NSViewController {

Trie/Trie/TrieTests/TrieTests.swift

@@ -6,6 +6,11 @@
 //  Copyright © 2016 Rick Zaccone. All rights reserved.
 //
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+    print("Hello, Swift 4!")
+#endif
+
 import XCTest
 @testable import Trie