message: add utility for checking if currency is supported
diff: */
  import BigNumber from 'bignumber.js';
  -import { get, isNil } from 'lodash';
  +import { get, has, isNil } from 'lodash';
  import supportedNativeCurrencies from './native-currencies';
  +export const isSupportedCurrency = (nativeCurrency: string) => {
  + return has(supportedNativeCurrencies, `${nativeCurrency}`);
  +};
  +
  type BigNumberish = number | string | BigNumber;
  interface Asset {
  