add MessageAttributeNames to sqs.ReceiveMessageInput.

[yoanp]

I want to process by checking the attribute included in each message.
Please review adding MessageAttributeNames to the worker.go Start method as shown below.

params := &sqs.ReceiveMessageInput{
    QueueUrl:            aws.String(worker.Config.QueueURL), // Required
    MaxNumberOfMessages: aws.Int64(worker.Config.MaxNumberOfMessage),
    AttributeNames: []*string{
        aws.String("All"), // Required
    },
    MessageAttributeNames: []*string{
        aws.String(sqs.QueueAttributeNameAll),
    },
    WaitTimeSeconds: aws.Int64(worker.Config.WaitTimeSecond),
}

[melneff]

Also need this..

[aherve]

I created a PR for this: #16

[aint]

Hi there,
my fork supports MessageAttributeNames, check it out https://github.com/aint/go-sqs-poller.