append changelog

CHANGELOG.en-US.md

@@ -22,6 +22,7 @@ If you want to read change logs before `2.0.0`, please visit [GitHub](https://gi
 `2017-05-23`
 
 - Fix `prop-types` warnings which due to upgrading React. [#5678](https://github.com/ant-design/ant-design/issues/5678)
+- Fix `defaultValue` issue of DatePicker and RangePicker in showTime mode. [#6160](https://github.com/ant-design/ant-design/pull/6160)
 - Fix style issue of TreeSelect. [#6137](https://github.com/ant-design/ant-design/issues/6137)
 - Fix style issue of Input with prefix and addon. [#6144](https://github.com/ant-design/ant-design/issues/6144)
 - Fix some bugs of `notification.destroy`. [#6161](https://github.com/ant-design/ant-design/issues/6161)

CHANGELOG.zh-CN.md

@@ -22,6 +22,7 @@ timeline: true
 `2017-05-23`
 
 - 修复了 React 升级引起的 `prop-types` 相关的 warning 问题。[#5678](https://github.com/ant-design/ant-design/issues/5678)
+- 修复 DatePicker 和 RangePicker showTime 模式下 defaultValue 的问题。[#6160](https://github.com/ant-design/ant-design/pull/6160)
 - 修复 TreeSelect 的样式问题。[#6137](https://github.com/ant-design/ant-design/issues/6137)
 - 修复 包含 prefix 和 addon 的 Input 的样式问题。[#6144](https://github.com/ant-design/ant-design/issues/6144)
 - 修复 `notification.destroy` 的 Bug。[#6161](https://github.com/ant-design/ant-design/issues/6161)