title: How to add prefix "token" on django-yasg?
body: <p>I've installed <code>django-rest-framework</code> and <code>django-yasg</code> to generate the swagger documentation, when i try to use the ui from <code>django-yasg</code> the authentication does not use the prefix <code>Token</code> on the <code>Authentication</code> header, e.g:</p>
  
  <p>Header needed for <code>django-rest-framework</code>:</p>
  
  <blockquote>
    <p>"Authentication: Token XXX"</p>
  </blockquote>
  
  <p>Header generated by the <code>django-yasg</code>:</p>
  
  <blockquote>
    <p>"Authentication: XXX"</p>
  </blockquote>
  
  <p>I also have found this issue; <a href="https://github.com/axnsan12/drf-yasg/issues/367" rel="noreferrer">https://github.com/axnsan12/drf-yasg/issues/367</a>
  saying that i need to add the prefix <code>token</code> through the swagger-ui, but how can i do this?</p>
  
  <p>This my <code>swagger settings</code>:</p>
  
  <pre><code>SWAGGER_SETTINGS = {
      'SECURITY_DEFINITIONS': {
          'Token': {
              'type': 'apiKey',
              'name': 'Authorization',
              'in': 'header'
          },
      },
      'USE_SESSION_AUTH': False
  }
  </code></pre>
  
  <p>How can i set the prefix on the swagger-ui so the user does have to write it?</p>