Return the ::base:: to ::target:: exchange rate.
    Wraps around ::Cryptonator.get_exchange_rate::.

def get_exchange_rate(base, target, *args, **kwargs):
    """
    Return the ::base:: to ::target:: exchange rate.
    Wraps around ::Cryptonator.get_exchange_rate::.
    """
    return Cryptonator().get_exchange_rate(base, target, *args, **kwargs)