message: docs(changelog): 2.3.0-beta.1
diff: # Changelog
  +### [v2.3.0-beta.1](https://github.com/youzan/vant/tree/v2.3.0-beta.1)
  +`2019-11-30`
  +
  +**Style**
  +
  +Upgrading the style of business components:
  +
  +- AddressEdit
  +- Card
  +- ContactList
  +- ContactCard
  +- ContactEdit
  +- SubmitBar
  +
  +**Features**
  +
  +- Card: add price-top slot [\#5134](https://github.com/youzan/vant/pull/5134)
  +- Circle: add stroke-linecap prop [\#5087](https://github.com/youzan/vant/pull/5087)
  +- CountDown: support SS and S format [\#5154](https://github.com/youzan/vant/pull/5154)
  +- Sku: add new startSaleNum prop [\#5105](https://github.com/youzan/vant/pull/5105)
  +- SubmitBar: add text-align prop [\#5130](https://github.com/youzan/vant/pull/5130)
  +- AddressList: add default-tag-text prop [\#5106](https://github.com/youzan/vant/pull/5106)
  +- ContactList: add default-tag-text prop [\#5089](https://github.com/youzan/vant/pull/5089)
  +- ContactCard: add show-set-default prop [\#5083](https://github.com/youzan/vant/pull/5083)
  +- Toast: improve type definitions [\#5086](https://github.com/youzan/vant/pull/5086)
  +
  +**Bug Fixes**
  +
  +- fix TreeSelect should sync value before trigger click-item event [\#5153](https://github.com/youzan/vant/pull/5153)
  +- fix TouchEmulator compatibility issues on firefox [\#5118](https://github.com/youzan/vant/pull/5118)
  +- fix Card allow use bottom slot without price or num [\#5116](https://github.com/youzan/vant/pull/5116)
  +- fix NumberKeyboard should not trigger blur event when hidden [\#5110](https://github.com/youzan/vant/pull/5110)
  +
  +
  ### [v2.2.15](https://github.com/youzan/vant/tree/v2.2.15)
  `2019-11-28`
  