message: docs(Cascader): fix missing options
diff: @@ -26,6 +26,7 @@ Vue.use(Cascader);
  <van-cascader
  v-model="cascaderValue"
  title="Select Area"
  + :options="options"
  @close="show = false"
  @finish="onFinish"
  />
  @@ -68,6 +69,7 @@ export default {
  <van-cascader
  v-model="cascaderValue"
  title="Select Area"
  + :options="options"
  active-color="#1989fa"
  @close="show = false"
  @finish="onFinish"
  @@ -89,6 +91,7 @@ export default {
  <van-cascader
  v-model="cascaderValue"
  title="Select Area"
  + :options="options"
  @close="show = false"
  @change="onChange"
  @finish="onFinish"
  