message: docs(changelog): 2.2.3
diff: # Changelog
  +### [v2.2.3](https://github.com/youzan/vant/tree/v2.2.3)
  +`2019-09-24`
  +
  +**Features**
  +
  +- Cell: improve accessibility [\#4519](https://github.com/youzan/vant/pull/4519)
  +- Popup: improve accessibility [\#4516](https://github.com/youzan/vant/pull/4516)
  +- Search: improve accessibility [\#4522](https://github.com/youzan/vant/pull/4522)
  +- Picker: improve accessibility [\#4521](https://github.com/youzan/vant/pull/4521)
  +- GridItem: improve accessbility [\#4517](https://github.com/youzan/vant/pull/4517)
  +- ActionSheet: improve accessibility [\#4525](https://github.com/youzan/vant/pull/4525)
  +- Sku: add sku item previewImgUrl [\#4562](https://github.com/youzan/vant/pull/4562)
  +- ActionSheet: enable round by default [\#4542](https://github.com/youzan/vant/pull/4542)
  +- RadioGroup: add icon-size prop [\#4529](https://github.com/youzan/vant/pull/4529)
  +- RadioGroup: add checked-color prop [\#4532](https://github.com/youzan/vant/pull/4532)
  +- CheckboxGroup: add icon-size prop [\#4530](https://github.com/youzan/vant/pull/4530)
  +- CheckboxGroup: add checked-color prop [\#4531](https://github.com/youzan/vant/pull/4531)
  +- ActionSheet: enable safe-area-inset-bottom by default [\#4524](https://github.com/youzan/vant/pull/4524)
  +- NumberKeyboard: enable safe-area-inset-bottom by default [\#4544](https://github.com/youzan/vant/pull/4544)
  +
  +
  ### [v2.2.2](https://github.com/youzan/vant/tree/v2.2.2)
  `2019-09-19`
  