update changelog for RangePicker placeholder, #5721

CHANGELOG.en-US.md

@@ -478,6 +478,7 @@ If you want to read change logs before `2.0.0`, please visit [GitHub](https://gi
   * RangePicker can set presetted ranges. [demo](https://ant.design/components/date-picker/#components-date-picker-demo-presetted-ranges)
   * Fix "Now" button doesn't work while `DatePicker[showTime]` is set. [#3748](https://github.com/ant-design/ant-design/issues/3748)
   * Fix `RangePicker[format]` should work. [#3808](https://github.com/ant-design/ant-design/issues/3808)
+  * Fix issue that RangePicker `placeholder=['xx', 'xx']` not working.
 * Add and update some icons. [#3977](https://github.com/ant-design/ant-design/pull/3977)
 * New component `Input.Search`. [demo](https://ant.design/components/input/#components-input-demo-search-input)
 * Mention onSelect event will get complete record. [#3867](https://github.com/ant-design/ant-design/issues/3867)

CHANGELOG.zh-CN.md

@@ -478,6 +478,7 @@ timeline: true
   * RangePicker 现在可以自定义快捷选择。[demo](https://ant.design/components/date-picker/#components-date-picker-demo-presetted-ranges)
   * 修复 DatePicker 设置 `showTime` 后 “此刻” 按钮失效的问题。[#3748](https://github.com/ant-design/ant-design/issues/3748)
   * 修复 `RangePicker[format]` 失效的问题。[#3808](https://github.com/ant-design/ant-design/issues/3808)
+  * 修复 RangePicker `placeholder=['xx', 'xx']` 失效的问题。
 * 新增并优化部分 Icon。[#3977](https://github.com/ant-design/ant-design/pull/3977)
 * 新增 Input.Search 控件。[demo](https://ant.design/components/input/#components-input-demo-search-input)
 * Mention onSelect 事件现在可以获取完整的数据。[#3867](https://github.com/ant-design/ant-design/issues/3867)