Fixes minor issue where attachment Content-Type is being overwritten in wrapper (and dirty fix for binary attachments on python2) #321
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When attaching files, xero may expect to receive the Content-Type of the file being attached. However the wrapper always overwrites it to "application/xml".
In practice, this has not real impact at the moment, as xero ignores the user provided mime type and the actual file content, and "guess" the mime type from the file name only.