message: chore(express): update import
  import CustomSigningFunction from core
  Ticket:
diff: /**
  * @prettier
  */
  +import { CustomSigningFunction } from '@bitgo/sdk-core';
  import { CoinFamily } from '@bitgo/statics';
  -import {
  - BaseCoin,
  - BitGo,
  - BitGoOptions,
  - Coin,
  - CustomSigningFunction,
  - Errors,
  - SignedTransaction,
  - TransactionPrebuild,
  -} from 'bitgo';
  +import { BaseCoin, BitGo, BitGoOptions, Coin, Errors, SignedTransaction, TransactionPrebuild } from 'bitgo';
  import * as bodyParser from 'body-parser';
  import * as debugLib from 'debug';
  import * as express from 'express';
  