title: Codable Swift 4
body: <p>I am not sure how decode emotion field by using codable, it is complicated for me due structure of this JSON ... I need only parse emotion field.</p>
  
  <pre><code>{
      "image_id": "HvRRq86gYY96sVNP+lXHYg==",
      "request_id": "1525001300,f1cf060a-dbba-424a-ad75-c315298bbadb",
      "time_used": 444,
      "faces": [
          {
              "attributes": {
                  "emotion": {
                      "sadness": 13.562,
                      "neutral": 86.409,
                      "disgust": 0.001,
                      "anger": 0.003,
                      "surprise": 0.002,
                      "fear": 0.022,
                      "happiness": 0.001
                  }
              },
              "face_rectangle": {
                  "width": 800,
                  "top": 451,
                  "left": 58,
                  "height": 800
              },
              "face_token": "75985eed763e1a7cc9aad61c88f492a1"
          }
      ]
  }
  </code></pre>