message: docs(changelog): 2.3.2
diff: # Changelog
  +### [v2.3.2](https://github.com/youzan/vant/tree/v2.3.2)
  +`2019-12-20`
  +
  +**Bug Fixes**
  +
  +- fix Area missing style
  +- fix DatetimePicker missing style
  +- fix CountDown infinite tick if call reset after finish [\#5340](https://github.com/youzan/vant/pull/5340)
  +- fix ImagePreview onClose should only trigger once [\#5341](https://github.com/youzan/vant/pull/5341)
  +
  +
  ### [v2.3.1](https://github.com/youzan/vant/tree/v2.3.1)
  `2019-12-20`
  