v1.1.0

• Feature: Add all() helper to await successful fulfillment of all operations
  (#8 by @clue)

  // new: limit concurrency while awaiting all operations to complete
  $promise = Queue::all(3, $urls, function ($url) use ($browser) {
      return $browser->get($url);
  });
  
  $promise->then(function (array $responses) {
      echo 'All ' . count($responses) . ' successful!' . PHP_EOL;
  });

• Fix: Implement cancellation forwarding for previously queued operations
  (#7 by @clue)