Updated sharedApplication() to shared()

In OS X conditional.

Handle/Handle/NSNotificationCenterExtensions.swift

@@ -82,7 +82,7 @@ extension NotificationCenter
     public func post(_ notificationName:String)
     {
         #if os(OSX)
-            self.post(notificationName, from: NSApplication.sharedApplication(), with: /* userInfo as */ nil)
+            self.post(notificationName, from: NSApplication.shared(), with: /* userInfo as */ nil)
         #elseif os(iOS)
             self.post(notificationName, from: UIApplication.shared(), with: /* userInfo as */ nil)
         #endif