> there's no relative routes https://github.com/ReactTraining/react-router/issues/2172

I've been managing "relative" routes by just using `match.path` and `match.url` from the previous route. Works fine.

    function Parent(props) {
      return (
        <>
          <Link to='/child'>Child</Link>
          <Route path='/child' component={Child}/>
        </>
      );
    }

    function Child({match}) {
      return (
        <>
          <Link to={`${match.url}/grandchild`}>Grandchild</Link>
          <Route path={`${match.path}/grandchild`} component={Grandchild} />
        </>
      )
    }