Mainnet Integration

For using the Mainnet change the NAG url to https://circularlabs.io/NAG_Mainnet.php?cep= with the setNAGURL method.

from circular_protocol_api import CircularProtocolAPI

circular = CircularProtocolAPI()
circular.setNAGURL("https://circularlabs.io/NAG_Mainnet.php?cep=")