message: docs(changelog): 2.4.4
diff: # Changelog
  +### [v2.4.4](https://github.com/youzan/vant/compare/v2.4.3...v2.4.4)
  +`2020-01-24`
  +
  +**Feature**
  +
  +* Card: change thumb fit mode to cover [e766d5](https://github.com/youzan/vant/commit/e766d5d5743e7f492b3601ce4010b8524fb2b016)
  +* Calendar: add get-contaienr prop [#5609](https://github.com/youzan/vant/issues/5609)
  +* Calendar: add close-on-popstate prop [2b82dc](https://github.com/youzan/vant/commit/2b82dcc3dd2dba678aba5e0533e0ff6af7c55b11)
  +* CountDown: add change event [#5599](https://github.com/youzan/vant/issues/5599)
  +* GoodsActionButton: add icon prop [b83bed](https://github.com/youzan/vant/commit/b83bed3b6c41d0896386b3c4b6380c9568bd3ef2)
  +
  +**Bug Fixes**
  +
  +* Sku: get-container can be string type [#5608](https://github.com/youzan/vant/issues/5608)
  +
  +
  ### [v2.4.3](https://github.com/youzan/vant/compare/v2.4.3-beta.0...v2.4.3)
  `2020-01-19`
  