message: [changelog] 1.6.19
diff: ## Changelog
  +## [v1.6.19](https://github.com/youzan/vant/tree/v1.6.19)
  +`2019-05-16`
  +
  +**Bug Fixes**
  +
  +- fix Col should set min-height
  +- fix Uploader should clip file-upload-button
  +- fix Tabbar should not render info when info is empty string
  +- fix is-src utils data URLs should be prefixed with the data:image [\#3308](https://github.com/youzan/vant/pull/3308) [\#3300](https://github.com/youzan/vant/pull/3300)
  +
  +
  ## [v1.6.18](https://github.com/youzan/vant/tree/v1.6.18)
  `2019-05-10`
  