Add IE11 support

[alverdal]

The Tabs component is using the "method definition shorthand syntax" which isn't supported by IE11, see property "children" .

export const Tabs = ({ state: outerState, children }) => { const innerState = useState(0) const elements = useConstant(() => ({ tabs: 0, panels: 0 })) const state = outerState || innerState

Would it be possible to add IE11 support via browserlist?