title: How to handle nested JSON in Swift 4
body: <p>I'm doing my own decked out "hello world" and I've decided to handle an JSON response from an URL.
  I've read a lot of posts on how do handle <code>JSON</code> with <code>Codable</code> structs but I can't figure out how to create the Codable structs for this nested JSON.</p>
  
  <pre><code>{
      "acumulado": "sim",
      "cidades": [],
      "data": "2018-05-02",
      "ganhadores": [
          0,
          91,
          6675
      ],
      "numero": 2036,
      "proximo_data": "2018-05-05",
      "proximo_estimativa": 22000000,
      "rateio": [
          0,
          21948.81,
          427.46
      ],
      "sorteio": [
          7,
          8,
          19,
          23,
          27,
          58
      ],
      "valor_acumulado": 18189847.7
  }
  </code></pre>
  
  <p>This is a sample of a JSON returned from the API, how do I create a Codable struct to handle it?
  Ps: I know that there are a lot of posts out there that cover this, but I can't figure out how to make it work with my sample.</p>