title: Apple tvOS network not available notification
body: <p>I am using the <code>Reachability</code> class to check whether the network is available or not in my tvOS app.</p>
  
  <p>When I try the notification <code>kReachabilityChangedNotification</code> its not calling the the method.</p>
  
  <pre><code>[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleNetworkChange:) name:kReachabilityChangedNotification object:nil];
  </code></pre>
  
  <p>The method <code>handleNetworkChange</code> is not getting called.</p>