Add/update some currency exchange details

Exchangeratesapi.io was bought and now requires a key

Found another alternative not listed here, and added it: Exchangerate.host

README.md

@@ -243,7 +243,8 @@ API | Description | Auth | HTTPS | CORS |
 | [CurrencyScoop](https://currencyscoop.com/api-documentation) | Real-time and historical currency rates JSON API | `apiKey` | Yes | Yes |
 | [Czech National Bank](https://www.cnb.cz/cs/financni_trhy/devizovy_trh/kurzy_devizoveho_trhu/denni_kurz.xml) | A collection of exchange rates | No | Yes | Unknown |
 | [ExchangeRate-API](https://www.exchangerate-api.com) | Free currency conversion | No | Yes | Yes |
-| [Exchangeratesapi.io](https://exchangeratesapi.io) | Exchange rates with currency conversion | No | Yes | Yes |
+| [Exchangerate.host](https://exchangerate.host) | Free foreign exchange & crypto rates API | No | Yes | Unknown |
+| [Exchangeratesapi.io](https://exchangeratesapi.io) | Exchange rates with currency conversion | `apiKey` | Yes | Yes |
 | [Frankfurter](https://www.frankfurter.app/docs) | Exchange rates, currency conversion and time series | No | Yes | Yes |
 | [National Bank of Poland](http://api.nbp.pl/en.html) | A collection of currency exchange rates (data in XML and JSON) | No | Yes | Yes |
 | [ratesapi](https://ratesapi.io) | Free exchange rates and historical rates | No | Yes | Unknown |