fix(Eth): import isNumber

Author: Philip Welber

src/eth/eth-wallet.js

@@ -4,7 +4,7 @@ const ethUtil = require('ethereumjs-util');
 const WalletCrypto = require('../wallet-crypto');
 const EthHd = require('ethereumjs-wallet/hdkey');
 const { construct, has } = require('ramda');
-const { isPositiveNumber, isHex, asyncOnce, dedup, unsortedEquals } = require('../helpers');
+const { isPositiveNumber, isHex, asyncOnce, dedup, unsortedEquals, isNumber } = require('../helpers');
 const API = require('../api');
 const EthTxBuilder = require('./eth-tx-builder');
 const EthAccount = require('./eth-account');