message: docs(changelog): 2.1.7
diff: # Changelog
  +### [v2.1.7](https://github.com/youzan/vant/tree/v2.1.7)
  +`2019-08-26`
  +
  +**Bug Fixes**
  +
  +- fix RadioGroup disabled prop not work [\#4242](https://github.com/youzan/vant/pull/4242)
  +- fix CheckboxGroup disabled prop not work [\#4242](https://github.com/youzan/vant/pull/4242)
  +
  +
  ### [v2.1.6](https://github.com/youzan/vant/tree/v2.1.6)
  `2019-08-26`
  - Sku: can preview images of non-first level sku [\#4236](https://github.com/youzan/vant/pull/4236)
  - Locale: add Spanish translation [\#4235](https://github.com/youzan/vant/pull/4235)
  -**Bug Fixes**
  - fix Tabbar incorrect active style in route mode [\#4229](https://github.com/youzan/vant/pull/4229)
  - fix NumberKeyboard incorrect sidebar position when has title [\#4228](https://github.com/youzan/vant/pull/4228)
  