mrlimacz

Implement ECBrates source for exchange rates

5

This source used ECB datasets directly (daily average spot rates). As they only provide EUR as the base currency, other pairs need to be calculated as XXX -> EUR ->...

ratesapi source no longer works

3

Looks like [exchangerate.host](https://exchangerate.host/) no longer works - they require an API key now and also a the response structure changed. I think it's a similar thing that happened to ratesapi.io...