Need suppport for nigerian currency

[HarshikaSM]

Currentlty there is no support for nigerian currrency. It will be helpful if the support for the same is added, so that the value gets displayed properly.

[dm4t2]

This should already work with {currency: 'NGN'}, shouldn't it?

https://dm4t2.github.io/vue-currency-input/config.html#currency

[HarshikaSM]

The currency code is getting displayed instead of the currency symbol. This is the config and the value being displayed.
{"locale":"yo-NG", "currency":"NGN", "valueAsInteger":false, "hideGroupingSymbol":false, "hideCurrencySymbol":false, "hideNegligibleDecimalDigits":true, "precision":0, "autoDecimalMode":false, "allowNegative":true }

Also created anpther example for reference: https://codepen.io/HarshikaSM/pen/wvNxgVK

[dm4t2]

For some reason, the currency symbol "₦" is only displayed with {currencyDisplay: 'narrowSymbol'}.
Please note, that problems with Intl.NumberFormat should be reported at https://github.com/tc39/ecma402.

[HarshikaSM]

If i change the prefix in CurrencyInputOptions , then the symbol is getting displayed.