update changelog

CHANGELOG.en-US.md

@@ -19,7 +19,7 @@ If you want to read change logs before `2.0.0`, please visit [GitHub](https://gi
 
 ## 2.12.2
 
-`2017-07-21`
+`2017-07-22`
 
 - Longer message duration (1.5s to 3s).
 - Fix Anchor links not highlighted. [#6473](https://github.com/ant-design/ant-design/issues/6473)

CHANGELOG.zh-CN.md

@@ -19,7 +19,7 @@ timeline: true
 
 ## 2.12.2
 
-`2017-07-21`
+`2017-07-22`
 
 - 将 message 默认出现的时长从 1.5s 调整为 3s。
 - 重构了 Anchor，修复未滚动时链接没有高亮的问题。[#6473](https://github.com/ant-design/ant-design/issues/6473)