1.0.1

• Updated build_get_utxo_request_handler function to accept an additional parameter from used for pagination.
• Updated parse_get_utxo_response_handler function to return an additional parameter next pointing to the next slice of payment sources.
• Added sign_with_address_handler function to sign a message with a payment address.
• Added verify_with_address_handler function to verify a signature with a payment address.
• bugfixes