The readme links to [a GeoJSON file](https://s3.amazonaws.com/geojson-please/naturalearth-3.3.0/ne_50m_admin_0_countries.geojson) that seems to be missing: https://github.com/mapbox/which-polygon/blob/e6faafe98ba4623e3c45fc00a24bdd018169f174/README.md#L10 /cc @mourner
