Remove temporary index
Remove temporary index

It seems that `setState` is not updating the `this.state.index` *synchronously*
because the value is the same before and after `setState` is executed. The
same happens with the call to `render`. It is not called when `setState`
is executed.

AppSorcery/react-rating,dreyescat/react-rating,AppSorcery/react-rating,mkarajohn/react-rating,dreyescat/react-rating,dreyescat/react-rating,mkarajohn/react-rating,AppSorcery/react-rating,mkarajohn/react-rating