leex

更正拼写错误，[71行](https://github.com/iview/iview-admin/blob/master/src/components/count-to/count-to.vue#L71)是`usegroup`，[158行](https://github.com/iview/iview-admin/blob/master/src/components/count-to/count-to.vue#L158)是`useGroup`。

fix: play icon not appear in Safari

1

As you can see, the icon for the play button does not appear in Safari. before: after: