Wrap raw geometries in feature collections

[1ec5]

This library assumes that a GeoJSON object can only contain Feature and FeatureCollection objects, but it can also contain raw Geometry objects such as Point or MultiPolygon:

{
  "type": "Point",
  "coordinates": [0, 0],
}

We haven’t been running into these geometries because we rely on geojson-normalize to wrap them in FeatureCollections via static-map-string-format. We should either make geojson-normalize a dependency of this library or duplicate its functionality here.

/cc @bsudekum