[metrics-billing.rb] provide a way to ask for a different currency than USD

[arthurzenika]

It would be nice to have a configuration option to ask for a different currency (eg. EUR in our case), via a command line option for example.

$ metrics-billing.rb -h
Usage: /usr/local/bin/metrics-billing.rb (options)
    -r, --aws-region REGION          AWS Region (defaults to us-east-1).
    -s, --scheme SCHEME              Metric naming scheme, text to prepend to metric
    -S SERVICES_NAME,                The name of the AWS service (http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/billing-metricscollected.html)
        --services-name
   --currency  CURRENCY            Currency for metric (defaults to USD)

[majormoses]

makes sense to me any chance you'd be willing to work on an enhancement?