Fix lint for order-utils

packages/order-utils/src/assert.ts

@@ -1,6 +1,6 @@
 import { assert as sharedAssert } from '@0xproject/assert';
 // HACK: We need those two unused imports because they're actually used by sharedAssert which gets injected here
-// tslint:disable-next-line:no-unused-variable
+// tslint:disable:no-unused-variable
 import { Schema } from '@0xproject/json-schemas';
 import { ECSignature, SignatureType } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';