fix eslint

yyx990803 · yyx990803 · commit ef4fc1c75221 · 2016-11-15T15:21:34.000-05:00
diff --git a/src/core/util/options.js b/src/core/util/options.js
@@ -6,7 +6,6 @@ import { warn } from './debug'
 import { set } from '../observer/index'
 import {
   extend,
-  isObject,
   isPlainObject,
   hasOwn,
   camelize,
