message: docs(changelog): 2.5.7
diff: # Changelog
  +### [v2.5.7](https://github.com/youzan/vant/compare/v2.5.6...v2.5.7)
  +
  +`2020-03-20`
  +
  +**Bug Fixes**
  +
  +- Locale: fix incorrect japanese filename [e8c88a](https://github.com/youzan/vant/commit/e8c88a380217eb48cef8aa7dc29d378a1031120a)
  +
  +
  ### [v2.5.6](https://github.com/youzan/vant/compare/v2.5.5...v2.5.6)
  `2020-03-20`
  