message: use anonymous function for getUSDConverter
diff: @@ -16,7 +16,7 @@ export default class ExchangeRate {
  const usdRawRate = new BN((await oracle.methods.usdPrice().call()).price);
  const oracleDecimals = Number(await oracle.methods.decimals().call());
  - return function convertToUsd(amountInWei: string): number {
  + return (amountInWei) => {
  let rawAmount = usdRawRate.mul(new BN(amountInWei)).div(ten.pow(tokenDecimals));
  return safeFloatConvert(rawAmount, oracleDecimals);
  };
  