sync with upstream tutorial wording changes

Author: jeffweiss

elixir/new_task.exs

@@ -9,7 +9,7 @@ message =
     words -> Enum.join(words, " ")
   end
 
-AMQP.Basic.publish(channel, "", "hello", message, persistent: true)
+AMQP.Basic.publish(channel, "", "task_queue", message, persistent: true)
 IO.puts " [x] Sent '#{message}'"
 
 AMQP.Connection.close(connection)