Braintree

* 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

* Add LICENSE metadata. Thanks graingert.
* Allow custom verification amount on payment method updates.
* Fix a bug where `merchant_account.all` would attempt to fetch too many pages of merchant accounts