updated currency supported info

README.md

@@ -819,7 +819,7 @@ Frequently asked questions:
 
 - Q: Which currencies can I convert to?
 
-  - A: The supported fiat currencies for conversion are `AUD`, `BRL`, `CAD`, `CFH`, `CLP`, `CNY`, `CZK`, `DKK`, `EUR`, `GBP`, `HKD`, `HUF`, `IDR`, `ILS`, `INR`, `JPY`, `KRW`, `MXN`, `MYR`, `NOK`, `NZD`, `PLN`, `PHP`, `PKR`, `RUB`, `SEK`, `SGD`, `THB`, `TRY`, `TWD`, `USD`, and `ZAR`.
+  - A: The supported fiat currencies for conversion are `AUD`, `BRL`, `CAD`, `CFH`, `CLP`, `CNY`, `CZK`, `DKK`, `EUR`, `GBP`, `HKD`, `HUF`, `IDR`, `ILS`, `INR`, `JPY`, `KRW`, `MXN`, `MYR`, `NOK`, `NZD`, `PLN`, `PHP`, `PKR`, `RUB`, `SEK`, `SGD`, `THB`, `TRY`, `TWD`, `USD`, `ZAR` and `VND`.
 
     The supported crypto currencies for conversion are `BTC` and `ETH`.