message: not visit descendants when callback return true in Group#traverse
diff: @@ -8,7 +8,6 @@ import BoundingRect, { RectLike } from './core/BoundingRect';
  import Eventful, {EventQuery, EventCallback} from './core/Eventful';
  import ZRText from './graphic/Text';
  import { calculateTextPosition, TextPositionCalculationResult } from './contain/text';
  -import Storage from './Storage';
  import {
  guid,
  isObject,
  @@ -16,9 +15,7 @@ import {
  extend,
  indexOf,
  logError,
  - isString,
  mixin,
  - isFunction,
  isArrayLike
  } from './core/util';
  import { Group } from './export';
  