Fix tslint errors

packages/0x.js/src/0x.ts

@@ -1,12 +1,12 @@
 import { assert } from '@0xproject/assert';
 import {
     ContractWrappers,
+    ContractWrappersConfig,
     EtherTokenWrapper,
     ExchangeWrapper,
     TokenRegistryWrapper,
     TokenTransferProxyWrapper,
     TokenWrapper,
-    ContractWrappersConfig,
 } from '@0xproject/contract-wrappers';
 import {
     generatePseudoRandomSalt,

packages/contracts/test/ether_token.ts

@@ -1,4 +1,4 @@
-import { ZeroEx, ContractWrappersError } from '0x.js';
+import { ContractWrappersError, ZeroEx } from '0x.js';
 import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
 import { BigNumber, promisify } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';