docs: update attributes.md (vuejs#370)

fimars · eddyerburgh · commit 29f53dbedb46 · 2018-01-22T09:49:49.000Z
diff --git a/docs/zh-cn/api/wrapper/attributes.md b/docs/zh-cn/api/wrapper/attributes.md
@@ -13,3 +13,4 @@ import Foo from './Foo.vue'
 
 const wrapper = mount(Foo)
 expect(wrapper.attributes().id).toBe('foo')
+```

Original file line number	Diff line number	Diff line change
`@@ -13,3 +13,4 @@ import Foo from './Foo.vue'`
`13`	`13`
`14`	`14`	`const wrapper = mount(Foo)`
`15`	`15`	`expect(wrapper.attributes().id).toBe('foo')`
	`16`	+```