Allow temp file creation in ReportDownloadsApi

[ShepFc3]

We have reports that can reach multiple GBs that we need to download. I would like the ability to pass return_type: 'File' in the options. This would be much more efficient than receiving the report in the response body. Is there a reason that the return_type isn't being passed in the below code?

https://github.com/CyberSource/cybersource-rest-client-ruby/blob/master/lib/cybersource_rest_client/api/report_downloads_api.rb#L94-L99

[ShepFc3]

I have made the changes for this specific case to work, but I would like to avoid running off of a fork.

[ShepFc3]

Anyone able to help me with this one?