Log Message:
py-braintree: updated to 4.0.0

4.0.0
Split development and deployments requirements files out
Add Authentication Insight to payment method nonce create
Add ThreeDSecure test payment method nonces
Add test AuthenticationIds
Add three_d_secure_authentication_id to three_d_secure_info
Add three_d_secure_authentication_id support for transaction sale

Breaking Changes
Require Python 3.5+
Remove deprecated Transparent Redirect
Remove deprecated iDeal payment method
Apple Pay register_domains returns an ApplePayOptions object
Remove unrecognized status from Transaction, Subscription, and CreditCardVerification
Remove GrantedPaymentInstrumentUpdate kind from Webhook
Remove Coinbase references
Add GatewayTimeoutError, RequestTimeoutError exceptions
Rename DownForMaintenanceError exception to ServiceUnavailableError
Transaction line_items only returns the line items for a transaction response \ 
object. Use TransactionLineItem find_all to search all line items on a \ 
transaction, given a transaction_id
Upgrade API version to retrieve declined refund transactions
Remove all deprecated parameters, errors, and methods