Amend examples (#211)

examples/currency/history/node/historicRatesForACurrency.js

@@ -0,0 +1,15 @@
+import * as currency from "m3o/currency";
+
+// Returns the historic rates for a currency on a given date
+async function HistoricRatesForAcurrency() {
+  let currencyService = new currency.CurrencyService(
+    process.env.MICRO_API_TOKEN
+  );
+  let rsp = await currencyService.history({
+    code: "USD",
+    date: "2021-05-30",
+  });
+  console.log(rsp);
+}
+
+await HistoricRatesForAcurrency();