title: Laravel IN Validation or Validation by ENUM Values
body: <p>I'm initiating in Laravel. 
  I searched and not found how to validate data with some ENUM values. On below code I need that <code>type</code> must be just <code>DEFAULT</code> or <code>SOCIAL</code>. One or other:</p>
  
  <pre><code>$validator = Validator::make(Input::only(['username', 'password', 'type']), [
      'type' =&gt; '', // DEFAULT or SOCIAL values
      'username' =&gt; 'required|min:6|max:255',
      'password' =&gt; 'required|min:6|max:255'
  ]);
  </code></pre>
  
  <p>Is possible?</p>