A time series of exchange rates for a single currency.
Wraps the response of the /exchangerates/rates/{table}/{code} endpoint:
the currency metadata plus one NbpReq.Rate per quoted day.
Summary
Types
@type t() :: %NbpReq.CurrencyRates{ code: String.t(), currency: String.t(), rates: [NbpReq.Rate.t()], table: String.t() }