changelog for 2.7.0 (#14878)

* changelog for 2.7.0

* update

CHANGELOG.en-US.md

 ## Changelog
 
+### 2.7.0
+
+*2019-03-28*
+
+#### New features
+
+- Table
+  - Add support tree structure data (#14632 by @ziyoung)
+
+#### Bug fixes
+
+- Tabs
+  - Use primary color as boxShadow color (#14558 by @Richard-Choooou)
+  - Rerender when label changes (#14496 by @akki-jat)
+- Table
+  - Footer follows body cell align (#14730 by @ziyoung)
+- NavMenu
+  - Fix click el-submenu trigger childMenu pop again bug (#14443 by @PanJiaChen)
+- Dropdown
+  - Make compatible with 2.6 new v-slot syntax (#14832 by @ziyoung)
+- ColorPicker
+  - Fix handle error hex color string (#14793 by @iamkun)
+- Tree
+  - Revert pr #13349 (#14847 by @ziyoung)
+- Tooltip
+  - Display when initial value is true (#14826 by @ziyoung)
+- Docs
+  - Update cascader docs (#14442 by @panhezeng)
+- Style
+  - Fix media query in sm-only, md-only, lg-only (#14611 by @sinchang)
+
+#### Optimization
+
+- Chore
+  - Add webpage description (#14802 by @iamkun)
+
 ### 2.6.3
 
 *2019-03-21*

CHANGELOG.es.md

 ## Changelog
 
+### 2.7.0
+
+*2019-03-28*
+
+#### New features
+
+- Table
+  - Add support tree structure data (#14632 by @ziyoung)
+
+#### Bug fixes
+
+- Tabs
+  - Use primary color as boxShadow color (#14558 by @Richard-Choooou)
+  - Rerender when label changes (#14496 by @akki-jat)
+- Table
+  - Footer follows body cell align (#14730 by @ziyoung)
+- NavMenu
+  - Fix click el-submenu trigger childMenu pop again bug (#14443 by @PanJiaChen)
+- Dropdown
+  - Make compatible with 2.6 new v-slot syntax (#14832 by @ziyoung)
+- ColorPicker
+  - Fix handle error hex color string (#14793 by @iamkun)
+- Tree
+  - Revert pr #13349 (#14847 by @ziyoung)
+- Tooltip
+  - Display when initial value is true (#14826 by @ziyoung)
+- Docs
+  - Update cascader docs (#14442 by @panhezeng)
+- Style
+  - Fix media query in sm-only, md-only, lg-only (#14611 by @sinchang)
+
+#### Optimization
+
+- Chore
+  - Add webpage description (#14802 by @iamkun)
+
 ### 2.6.3
 
 *2019-03-21*

CHANGELOG.fr-FR.md

 ## Changelog
 
-### 2.6.2
+### 2.7.0
+
+*2019-03-28*
+
+#### New features
+
+- Table
+  - Add support tree structure data (#14632 by @ziyoung)
+
+#### Bug fixes
+
+- Tabs
+  - Use primary color as boxShadow color (#14558 by @Richard-Choooou)
+  - Rerender when label changes (#14496 by @akki-jat)
+- Table
+  - Footer follows body cell align (#14730 by @ziyoung)
+- NavMenu
+  - Fix click el-submenu trigger childMenu pop again bug (#14443 by @PanJiaChen)
+- Dropdown
+  - Make compatible with 2.6 new v-slot syntax (#14832 by @ziyoung)
+- ColorPicker
+  - Fix handle error hex color string (#14793 by @iamkun)
+- Tree
+  - Revert pr #13349 (#14847 by @ziyoung)
+- Tooltip
+  - Display when initial value is true (#14826 by @ziyoung)
+- Docs
+  - Update cascader docs (#14442 by @panhezeng)
+- Style
+  - Fix media query in sm-only, md-only, lg-only (#14611 by @sinchang)
+
+#### Optimization
+
+- Chore
+  - Add webpage description (#14802 by @iamkun)
 
 ### 2.6.3
 
@@ -12,6 +46,8 @@
 - Remove unnecessary DOM operation (#14788 by @ziyoung)
 - Fix DatePicker default-value DST (#14562 by @wacky6)
 
+### 2.6.2
+
 *2019-03-21*
 
 #### New features

CHANGELOG.zh-CN.md

 ## 更新日志
 
+### 2.7.0
+
+*2019-03-28*
+
+#### 新特性
+
+- Table
+  - 增加对树形结构数据的支持 (#14632 by @ziyoung)
+
+#### 修复
+
+- Tabs
+  - 阴影样式使用全局主颜色 (#14558 by @Richard-Choooou)
+  - 当 label 改变时触发更新 (#14496 by @akki-jat)
+- Table
+  - Table footer 与 body 的对齐一致 (#14730 by @ziyoung)
+- NavMenu
+  - 修复点击 el-submenu 多次触发 childMenu 问题 (#14443 by @PanJiaChen)
+- Dropdown
+  - 兼容 Vue 2.6 新 v-slot 语法 (#14832 by @ziyoung)
+- ColorPicker
+  - 修复十六进制颜色字符串解析问题 (#14793 by @iamkun)
+- Tree
+  - 恢复 pr #13349 (#14847 by @ziyoung)
+- Tooltip
+  - 当初始值为 true 时默认显示 (#14826 by @ziyoung)
+- Docs
+  - 更新 Cascader 文档 (#14442 by @panhezeng)
+- Style
+  - 修复媒体查询 sm-only, md-only, lg-only 问题 (#14611 by @sinchang)
+
+#### 优化
+
+- Chore
+  - 增加网页描述信息 (#14802 by @iamkun)
+
 ### 2.6.3
 
 *2019-03-21*