message: [changelog] 0.12.11
diff: ## Changelog
  +### [0.12.11](https://github.com/youzan/vant/tree/v0.12.11)
  +`2018-02-27`
  +
  +**Improvements**
  +
  +* Checkbox: add label-disabled prop [\#644](https://github.com/youzan/vant/pull/644) [@ddchef](https://github.com/ddchef)
  +* Popup: add click-overlay event [\#647](https://github.com/youzan/vant/pull/647) [@chenjiahan](https://github.com/chenjiahan)
  +* Icon: add warn icon [\#651](https://github.com/youzan/vant/pull/651) [@chenjiahan](https://github.com/chenjiahan)
  +* Icon: add info-o icon, optimize checked & underway icon [\#648](https://github.com/youzan/vant/pull/648) [@chenjiahan](https://github.com/chenjiahan)
  +
  +**Bug Fixes**
  +
  +* fix Button loading horizontal align [\#645](https://github.com/youzan/vant/pull/645) [@chenjiahan](https://github.com/chenjiahan)
  +
  +
  ### [0.12.10](https://github.com/youzan/vant/tree/v0.12.10)
  `2018-02-12`
  