Remove macOS example from documentation

Author: Tom Kemp

README.md

@@ -16,7 +16,6 @@ What else would you want? Head over to one of our example apps:
 
 - For iOS with Swift, see [ViewController.swift](https://github.com/pusher/pusher-websocket-swift/blob/master/iOS%20Example%20Swift/iOS%20Example%20Swift/ViewController.swift)
 - For iOS with Objective-C, see [ViewController.m](https://github.com/pusher/pusher-websocket-swift/blob/master/iOS%20Example%20Obj-C/iOS%20Example%20Obj-C/ViewController.m)
-- For macOS with Swift, see [AppDelegate.swift](https://github.com/pusher/pusher-websocket-swift/blob/master/macOS%20Example%20Swift/macOS%20Example%20Swift/AppDelegate.swift)
 
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