title: Get Queue Attributes not working
body: <p>I'm trying to get the approximate number of messages currently available in an SQS Queue. According to the documentation, I need to use getQueueAttributes, but I can't seem to get it to work. What am I doing wrong?</p>
  
  <pre><code>var params = {
    QueueUrl : queueUrl,
    AttributeName : 'ApproximateNumberOfMessages'
  }
  
  sqs.getQueueAttributes(params, function(err, data){
    console.log(data)
    //console.log(data.Attributes.ApproximateNumberOfMessages)
  })
  </code></pre>
  
  <p>It keeps on returning null for data.</p>