do not add dates later than end date to state file

[rrong]

Description of change

• Restrict the dates in the state file to be earlier or equal to the end date of each extraction. This way records will not be missed as described in Connection broken via Stitch #28.

Manual QA steps

• Ran the tap locally with no errors.
• Config file:

{"merchant_id": "<<my_merchant_id>>",
 "public_key": "<<my_public_key>>",
 "private_key": "<<my_private_key>>",
 "start_date": "2020-03-11T00:00:00Z"
}

Risks

• Tap will output more data than before - records with created_at before the tap's runtime, but an updated_at after the tap's runtime will be pushed again on the subsequent tap run.
• But it is better for the tap to guarantee at least one push for each record, than at most one push for each record

Rollback steps

• revert this branch

[cmerrick]

Hi @rrong, thanks for your contribution!

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[cmerrick]

You did it @rrong!

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