[new feature] Tab: add ellipsis prop (#2299)

packages/tab/en-US.md

@@ -160,6 +160,7 @@ In swipeable mode, you can switch tabs with swipe gestrue in the content
 | offset-top | Offset top when use sticky mode | `Number` | `0` |
 | swipeable | Whether to switch tabs with swipe gestrue in the content | `Boolean` | `false` |
 | animated | Whether to change tabs with animation | `Boolean` | `false` |
+| ellipsis | Whether to ellipsis too long title | `Boolean` | `true` |
 
 ### Tab API
 

packages/tab/zh-CN.md

@@ -164,6 +164,7 @@ export default {
 | offset-top | 粘性定位布局下与顶部的最小距离，单位 px | `Number` | `0` | 1.1.15 |
 | swipe-threshold | 滚动阈值，标签数量超过多少个可滚动 | `Number` | `4` | - |
 | animated | 是否开启切换标签内容时的转场动画 | `Boolean` | `false` | 1.4.5 |
+| ellipsis | 是否省略过长的标题文字 | `Boolean` | `true` | 1.5.0 |
 
 ### Tab API