Incorrect type in jsdoc

[huven]

Issue #408 is still present in the latest version.

I think the cause is that Attachments.upload has jsdoc that requires the file to be presented as Buffer, which is then passed to Transporter.upload which expects a Stream.

Successfully tested that calling Attachments.requestUpload (bypassing .upload as it has incorrect prototype) with a Stream works.

Change the jsdoc to require Stream instead of Buffer? Or add Buffer support to Transporter.upload?