message: docs(changelog): 2.2.0
diff: # Changelog
  +### [v2.2.0](https://github.com/youzan/vant/tree/v2.2.0)
  +`2019-09-06`
  +
  +**Features**
  +
  +- Style: update basic red color [\#4368](https://github.com/youzan/vant/pull/4368)
  +- Rate: add touchable prop [\#4361](https://github.com/youzan/vant/pull/4361)
  +- Rate: should be inline-block [\#4334](https://github.com/youzan/vant/pull/4334)
  +- Rate: optimize touchmove gesture [\#4336](https://github.com/youzan/vant/pull/4336)
  +- Popup: add closeable prop [\#4362](https://github.com/youzan/vant/pull/4362)
  +- Popup: add close-icon prop [\#4366](https://github.com/youzan/vant/pull/4366)
  +- Sidebar: remove border [\#4382](https://github.com/youzan/vant/pull/4382)
  +- SidebarItem add disabled prop [\#4325](https://github.com/youzan/vant/pull/4325)
  +- TreeSelect: add max prop [\#4323](https://github.com/youzan/vant/pull/4323)
  +- TreeSelect: support show info [\#4384](https://github.com/youzan/vant/pull/4384)
  +- Uploader: add close-preview event [\#4376](https://github.com/youzan/vant/pull/4376)
  +- ImagePreview: add image loading tip [\#4378](https://github.com/youzan/vant/pull/4378)
  +
  +**Bug Fixes**
  +
  +- fix Field should reset appearance in safari [\#4380](https://github.com/youzan/vant/pull/4380)
  +- fix Button should hide border when color is linear-gradient [\#4342](https://github.com/youzan/vant/pull/4342)
  +- fix Dialog should reset loading when closed [\#4352](https://github.com/youzan/vant/pull/4352)
  +- fix Slider should format initial value [\#4337](https://github.com/youzan/vant/pull/4337)
  +- fix Sidebar incorrect info position [\#4324](https://github.com/youzan/vant/pull/4324)
  +- fix DropdownItem missing default active color [\#4330](https://github.com/youzan/vant/pull/4330)
  +- fix NumberKeyboard incorrect button position in iphoneX [\#4304](https://github.com/youzan/vant/pull/4304)
  +- fix ImagePreview should reset scale after toggle [\#4319](https://github.com/youzan/vant/pull/4319)
  +- fix ImagePreview should emit change event when reset to start position [\#4320](https://github.com/youzan/vant/pull/4320)
  +
  +
  ### [v2.1.8](https://github.com/youzan/vant/tree/v2.1.8)
  `2019-08-29`
  