[new feature] Tab support vue-router (#305)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

docs/examples-docs/en-US/tabbar.md

@@ -97,3 +97,6 @@ export default {
 | icon | Icon name | `String` | - | Names from Icon Component |
 | dot | Whether to show red dot | `Boolean` | - | - |
 | info | Info message | `String` | - | - |
+| url | Link | `String` | - | - |
+| to | Target route of the link, same as to of `vue-router` | `String | Object` | - | - |
+| replace | If true, the navigation will not leave a history record | `String` | `false` | - |

docs/examples-docs/zh-CN/tabbar.md

@@ -109,3 +109,6 @@ export default {
 | icon | 图标名称 | `String` | - | Icon 组件中可用的类型 |
 | dot | 是否显示小红点 | `Boolean` | - | - |
 | info | 图标右上角提示信息 | `String` | - | - |
+| url | 跳转链接 | `String` | - | - |
+| to | 路由跳转对象，同 `vue-router` 的 to | `String | Object` | - | - |
+| replace | 跳转时是否替换当前 history | `String` | `false` | - |