message: [changelog] 0.11.1
diff: ## Changelog
  +### [0.11.1](https://github.com/youzan/vant/tree/v0.11.1)
  +`2017-11-24`
  +
  +**Improvements**
  +- Actionsheet: update close icon style [\#340](https://github.com/youzan/vant/pull/340) [@chenjiahan](https://github.com/chenjiahan)
  +- Popup: add overlayClass and overlayStyle props [\#349](https://github.com/youzan/vant/pull/349) [\#343](https://github.com/youzan/vant/pull/343) [@mickeyinfoshan](https://github.com/mickeyinfoshan) [@chenjiahan](https://github.com/chenjiahan)
  +- Icon: adjust unicode for better display [\#330](https://github.com/youzan/vant/pull/330) [@chenjiahan](https://github.com/chenjiahan)
  +- ImagePreview: support manually close [\#346](https://github.com/youzan/vant/pull/346) [@chenjiahan](https://github.com/chenjiahan)
  +- Tabbar: add slot-scope to avoid check by index [\#347](https://github.com/youzan/vant/pull/347) [@chuangbo](https://github.com/chuangbo)
  +- SubmitBar: add left slot [\#345](https://github.com/youzan/vant/pull/345) [@chenjiahan](https://github.com/chenjiahan)
  +- optimize component static classnames [\#337](https://github.com/youzan/vant/pull/337) [@chenjiahan](https://github.com/chenjiahan)
  +- optimize single line text ellipsis [\#334](https://github.com/youzan/vant/pull/334) [@chenjiahan](https://github.com/chenjiahan)
  +- optimize button css layer and GPU cost [\#336](https://github.com/youzan/vant/pull/336) [@deepkolos](https://github.com/deepkolos)
  +
  +**Bug Fixes**
  +- fix some bugs in SSR [\#344](https://github.com/youzan/vant/pull/344) [@chenjiahan](https://github.com/chenjiahan)
  +- fix DateTimePicker crashed when pass invalid props [\#333](https://github.com/youzan/vant/pull/333) [@chenjiahan](https://github.com/chenjiahan)
  +
  +
  ### [0.11.0](https://github.com/youzan/vant/tree/v0.11.0)
  `2017-11-17`
  