title: Use constants in swagger annotation
body: <p>I have the following code : 
  in <code>/lib/App/Vendor/bin</code> I created a file : <code>constants.php</code> with a define
  <code>define('AUTH', 'test');</code> Now when I tried to execute <code>php swagger --boostrap constants.php</code> </p>
  
  <p>I get the error : </p>
  
  <p><code>Scanning files in '/lib/App/Vendor/bin' ...[INFO] Required @SWG\Info() not found
  </code>
  I don't understand where is the problem. Please help me ! Thx in advance ! Help me please...Somebody now the problem ??</p>
  
  <pre><code>/**
  * @SWG\Swagger(
  *     schemes={"http","https"},
  *     host=AUTH,
  *     basePath="/",
  *     @SWG\Info(
  *         version="0.1",
  *         title="Api's ",
  *     ),
  * )
  */
  </code></pre>