message: docs(changelog): 2.12.0-beta.0
diff: @@ -16,6 +16,24 @@ Vant follows [Semantic Versioning 2.0.0](https://semver.org/lang/zh-CN/).
  ## Details
  +### [v2.12.0-beta.0](https://github.com/youzan/vant/compare/v2.11.3...v2.12.0-beta.0)
  +
  +`2020-12-21`
  +
  +**New Component**
  +
  +- add Cascader component [#7771](https://github.com/youzan/vant/pull/7771)
  +
  +<img src="https://b.yzcdn.cn/vant/cascader_1221.png">
  +
  +**Feature**
  +
  +- uploader: add single uploader preview image style [#7776](https://github.com/youzan/vant/issues/7776)
  +
  +**Bug Fixes**
  +
  +- Tab: should scroll into view when title changed [c919e9](https://github.com/youzan/vant/commit/c919e9dedaae8ecde8be944032e26474829c1253)
  +
  ### [v2.11.3](https://github.com/youzan/vant/compare/v2.11.2...v2.11.3)
  `2020-12-18`
  