remove duplicate changelog

CHANGELOG.en-US.md

@@ -30,7 +30,6 @@ If you want to read change logs before `2.0.0`, please visit [GitHub](https://gi
   - Fix the wrong size. [#4766](https://github.com/ant-design/ant-design/issues/4766)
   - Fix adding error character automatically. [#4778](https://github.com/ant-design/ant-design/issues/4778)
 - **Dropdown** Add the documentation and demo about positioning of Dropdown menus. [#4811](https://github.com/ant-design/ant-design/issues/4811)
-- **Icon** Unified naming style of some icons(original names remain valid while new names been added). [#4758](https://github.com/ant-design/ant-design/issues/4758)
 - **Layout** Improve Sider's animation effect. [#4752](https://github.com/ant-design/ant-design/issues/4752)
 - **LocaleProvider** Fix issues with the new Swedish locale provider. [pull-4762](https://github.com/ant-design/ant-design/pull/4762) [@JesperWe](https://github.com/JesperWe)
 - **RangePicker** Fix the overlapping problem about the date icon. [#4783](https://github.com/ant-design/ant-design/issues/4783) [@zhenzong](https://github.com/zhenzong)
@@ -38,8 +37,7 @@ If you want to read change logs before `2.0.0`, please visit [GitHub](https://gi
   - Add the missing value 'middle' for size definition. [#4819](https://github.com/ant-design/ant-design/pull/4819) [@warrenseymour](https://github.com/warrenseymour)
   - Fix controlled filter does not work with JSX style. [#4759](https://github.com/ant-design/ant-design/issues/4759)
   - Fix switch pagination problem. [#4779](https://github.com/ant-design/ant-design/issues/4779)
-  - Fix performance issues under IE11. [#4522](https://github.com/ant-design/ant-design/issues/4522)
-- **Tabs** Fix content missing problem since the second tab pane. [#4795](https://github.com/ant-design/ant-design/issues/4795)
+- **Tabs** Fix content missing problem since the second tab pane under IE9. [#4795](https://github.com/ant-design/ant-design/issues/4795)
 - **rc-pagination** Upgrade to ~1.7.0, add pageSize as onChange's second argument.
 - **Global optimization**
   - Make some bugfixes and optimizations about documentation、link and style.

CHANGELOG.zh-CN.md

@@ -30,7 +30,6 @@ timeline: true
   - 修复了 size 问题。[#4766](https://github.com/ant-design/ant-design/issues/4766)
   - 修复了自动加入其他字符的问题。[#4778](https://github.com/ant-design/ant-design/issues/4778)
 - **Dropdown** 补充了之前缺失的弹出框位置设定相关的文档及示例。[#4811](https://github.com/ant-design/ant-design/issues/4811)
-- **Icon** 统一了几个图标的命名风格（添加了别名，原有命名依然有效）。[#4758](https://github.com/ant-design/ant-design/issues/4758)
 - **Layout** 修复了侧边布局动效不平滑的问题。[#4752](https://github.com/ant-design/ant-design/issues/4752)
 - **LocaleProvider** 修复了瑞典语相关问题。[pull-4762](https://github.com/ant-design/ant-design/pull/4762) [@JesperWe](https://github.com/JesperWe)
 - **RangePicker** 修复了图标与表单校验反馈图标重叠的问题。[#4783](https://github.com/ant-design/ant-design/issues/4783) [@zhenzong](https://github.com/zhenzong)
@@ -38,7 +37,6 @@ timeline: true
   - 修复了 size 定义里没有 'middle' 的问题。[#4819](https://github.com/ant-design/ant-design/pull/4819) [@warrenseymour](https://github.com/warrenseymour)
   - 修复过滤功能在 JSX 模式下不生效的问题。[#4759](https://github.com/ant-design/ant-design/issues/4759)
   - 修复分页跳转问题。[#4779](https://github.com/ant-design/ant-design/issues/4779)
-  - 修复IE11下的性能问题。[#4522](https://github.com/ant-design/ant-design/issues/4522)
 - **Tabs** 修复了在 IE9 中从第二个标签页起都显示空白的问题。[#4795](https://github.com/ant-design/ant-design/issues/4795)
 - **rc-pagination** 升级至 ~1.7.0，onChange 增加 pageSize 参数。
 - **全局性优化**