message: [Doc] Tab: update document
diff: @@ -139,6 +139,7 @@ In swipeable mode, you can switch tabs with swipe gestrue in the content
  | Attribute | Description | Type | Default |
  |-----------|-----------|-----------|-------------|
  | v-model | Index of active tab | `String` `Number` | `0` |
  +| color | Tab color | `String` | `#f44` |
  | type | Can be set to `line` `card` | `String` | `line` |
  | duration | Toggle tab's animation time | `Number` | `0.2` | - |
  | line-width | Width of tab line (px) | `Number` | Width of active tab |
  @@ -146,7 +147,6 @@ In swipeable mode, you can switch tabs with swipe gestrue in the content
  | sticky | Whether to use sticky mode | `Boolean` | `false` |
  | offset-top | Offset top when use sticky mode | `Number` | `0` |
  | swipeable | Whether to switch tabs with swipe gestrue in the content | `Boolean` | `false` |
  -| color | Set tab's title color | `String` | - |
  ### Tab API
  