Add support for the Redshift `HEADER` option to the `UNLOAD` statement

[dschiavu]

Hi,

Would it be possible to add support for the Redshift HEADER option to the UNLOAD statement?

The HEADER option adds a CSV header (the query column names) to the output CSV file.

Thanks,
Danijel

[dschiavu]

FYI, I'm working on this feature now, planning to raise a Pull Request soon.

[dschiavu]

Done in Pull Request #76

[osloma]

This feature is REALLY welcome and needed because in my Team we need to simulate the output of a query run containing headers, as is returned by real Redshift. It's an amazing addition to the driver. Thanks so much @dschiavu !!