Capture broader authority

[thisisaaronland]

      "madsrdf:hasBroaderAuthority": {
        "@id": "http://id.loc.gov/authorities/subjects/sh98007138"
      }

[thisisaaronland]

Might be an array, might be a dictionary...

$> go run -mod vendor cmd/emit/main.go /usr/local/data/loc/lcsh.both.ndjson | grep -A 10 skos:broader

--
      "skos:broader": [
        {
          "@id": "http://id.loc.gov/authorities/subjects/sh85084840"
        },
        {
          "@id": "http://id.loc.gov/authorities/subjects/sh85084851"
        }
      ],
      "skos:changeNote": [
        {
          "@id": "_:N4f243d8c043d4b5bbe6a5b417334563a"
--
      "skos:broader": {
        "@id": "http://id.loc.gov/authorities/subjects/sh85012832"
      },
      "skos:changeNote": [
        {
          "@id": "_:N152d914e375746f2906cbf25031cf46e"
        },
        {
          "@id": "_:N37a7200020414f63ad47b49c5cb68622"
        }
      ],
--
      "skos:broader": {
        "@id": "http://id.loc.gov/authorities/subjects/sh99002032"
      },