title: 'Check' object has no attribute 'image' while using sightengine api
body: <p>I am using sightengine API to detect child sexual abuse in images. In order to do that I am trying to detect the nudity level in an image using sightengine API. The following example is provided in the documentation itself.</p>
  
  <pre><code>from sightengine.client import SightengineClient
  
  client = SightengineClient('api_user', 'api_key')
  output = client.check('nudity').image('https://d3m9459r9kwism.cloudfront.net/img/examples/example7.jpg')
  </code></pre>
  
  <p>Apart from copying the same code I am getting the following error.</p>
  
  <pre><code>Traceback (most recent call last):
    File "driver.py", line 3, in &lt;module&gt;
      output = client.check('nudity').image('https://d3m9459r9kwism.cloudfront.net/img/examples/example7.jpg')
  AttributeError: 'Check' object has no attribute 'image'
  </code></pre>
  
  <p>I have used both Python 2 and Python 3 for the same code but both raise the same error.</p>