message: [changelog] 0.12.6
diff: ## Changelog
  +### [0.12.6](https://github.com/youzan/vant/tree/v0.12.6)
  +`2018-01-25`
  +
  +**Improvements**
  +
  +* AddressEdit: add default slot [\#573](https://github.com/youzan/vant/pull/573) [@chenjiahan](https://github.com/chenjiahan)
  +* Uploader: support maxSize prop [\#575](https://github.com/youzan/vant/pull/575) [@chenjiahan](https://github.com/chenjiahan)
  +* Sku: add sku-body-top slot and resetSelectedSkuOnHide prop [\#568](https://github.com/youzan/vant/pull/568) [@w91](https://github.com/w91)
  +
  +**Bug Fixes**
  +
  +* fix Sku message error when overlimit [\#568](https://github.com/youzan/vant/pull/568) [@w91](https://github.com/w91)
  +* fix Toast work break [\#567](https://github.com/youzan/vant/pull/567) [@chenjiahan](https://github.com/chenjiahan)
  +* fix Tab active not work [\#572](https://github.com/youzan/vant/pull/572) [@chenjiahan](https://github.com/chenjiahan)
  ### [0.12.5](https://github.com/youzan/vant/tree/v0.12.5)
  `2018-01-23`
  