Fix linter issues

packages/0x.js/test/0x.js_test.ts

@@ -2,7 +2,6 @@ import { ContractWrappers } from '@0xproject/contract-wrappers';
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
-import * as _ from 'lodash';
 import 'mocha';
 
 import { ERC20TokenApprovalEventArgs, ERC20TokenEvents, LogWithDecodedArgs, ZeroEx } from '../src';

packages/0x.js/test/utils/token_utils.ts

@@ -1,6 +1,3 @@
-import { generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
-
 import { artifacts } from '../../src/artifacts';
 
 import { constants } from './constants';