Braintree

* Add support for upgrading a PayPal future payment refresh token to a billing agreement
* Fix braintree.Dispute.search to take a list of search criteria
* Add logic to remove deprecation warnings for encodestring and decodestring when used with python 3 (92)
* Fix spec to expect PayPal transaction to settle immediately after successful capture
* Add GrantedPaymentInstrumentUpdate webhook support
* Add ability to create a transaction from a shared nonce
* Add `options` -> `paypal` -> `shipping` for creating & updating customers as well as creating payment methods
* Do not convert to Decimal if amount is None in AuthorizationAdjustement (70)
* Add `device_data_captured` field to `risk_data`
* Add `bin_data` to `payment_method_nonce`

* Add iDEAL webhook support
* Add AuthorizationAdjustment class and `authorization_adjustments` to Transaction
* Coinbase is no longer a supported payment method. `PaymentMethodNoLongerSupported` will be returned for Coinbase operations
* Add facilitated details to Transaction if present
* Add `submit_for_settlement` option to `Subscription.retry_charge`
* Add `options` -> `paypal` -> `description` for creating and updating subscriptions
* Add Braintree.Dispute.find
* Add braintree.Dispute.accept
* Add braintree.Dispute.add_file_evidence
* Add braintree.Dispute.add_text_evidence
* Add braintree.Dispute.finalize
* Add braintree.Dispute.find
* Add braintree.Dispute.remove_evidence
* Add braintree.Dispute.search
* Add braintree.DocumentUpload

* Fix a bug where a null value for `amount` in `CreditCardVerification` would result in a `ValueError`
* Add docstrings for AttributeGetter and Search. Thanks sharma7n!
* Add support for additional PayPal options when vaulting a PayPal Order

* Add gzip support
* Fix a bug in CreditCardVerification where `amount` and `currency_iso_code` were always expected

* Fix a regression where `util/datetime_parser.py` was missing
* Add support for Visa Checkout
* Improve setup.py
* Verification response includes amount and currency iso code
* Add support for payee_email with paypal intent=order
* Add support for skip_avs & skip_cvs

* Add ConnectedMerchantStatusTransitioned and ConnectedMerchantPayPalStatusChanged Auth webhooks