Log Message:
py-braintree: updated to 3.59.0

3.59.0
Add RefundAuthHardDeclined and RefundAuthSoftDeclined to validation errors
Fix issue where managing Apple Pay domains would fail in Python 3.8+
Add level 2 processing options purchase_order_number, tax_amount, and tax_exempt \ 
to Transaction.submit_for_settlement
Add level 3 processing options discount_amount, shipping_amount, \ 
ships_from_postal_code, line_items to Transaction.submit_for_settlement