Evaluate quandl as fx-rate provider

[munichpavel]

given apparent acquisition by nasdaq (quandl.com re-routes to https://data.nasdaq.com/) (yup: Nasdaq-acquires-quandl

Alternative(s)

https://github.com/zaerald/fx-rates-api/ uses https://exchangeratesapi.io/

[munichpavel]

Quandl / nasdaq evaluation

• [x] account still exists