Update deprecated UIApplication, UIAlertController and UIAlertAction properties to reflect Swift 4.2

Author: leitdeux

Text to Speech/AppDelegate.swift

@@ -22,7 +22,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 
 
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
         return true
     }

Text to Speech/ViewController.swift

@@ -104,8 +104,8 @@ class ViewController: UIViewController {
 
     /** Error handling to make sure user fills in required fields before speaking. */
     func alertUser(title: String, text: String) {
-        let alert = UIAlertController(title: title, message: text, preferredStyle: UIAlertControllerStyle.alert)
-        alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default, handler: nil))
+        let alert = UIAlertController(title: title, message: text, preferredStyle: UIAlertController.Style.alert)
+        alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertAction.Style.default, handler: nil))
         self.present(alert, animated: true, completion: nil)
     }