updating obsolete method for BigQuery

[take4mats]

Thank you for providing nice tutorials.
This is quickest proposal to make it work with latest client library.

• Line 339: table.import(...) doesn't work and need to use table.load(...) instead.
• Line 341: job doesn't have promise()

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[fhinkel]

@take4mats thanks for the fix! Could you sign the CLA? Thank you

[ace-n]

N.B: We're planning to land a pretty big lint change soon - it might be easier to re-create this PR on top of it.

[take4mats]

@fhinkel sorry for belated reaction... @googlebot I signed it!

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[fhinkel]

@take4mats so sorry, as @ace-n mentioned, we landed a large change and have merge conflicts now. Do you want to resolve them? Thanks

[take4mats]

@fhinkel No, you can discard mine and prioritize the big change. Thank you.