title: PHONE_CALL permission not working in Dexter
body: <p>I have implemented <a href="https://github.com/Karumi/Dexter" rel="noreferrer">Dexter</a> in my app. It is work fine for CAMERA,EXTERNAL STORAGE and INTERNAL STORAGE permission. I want to call with PHONE_CALL permission with <a href="https://github.com/Karumi/Dexter" rel="noreferrer">Dexter</a>. When i call intent for phone call like this:</p>
  
  <pre><code>Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + strNum));
  startActivity(callIntent);
  </code></pre>
  
  <p>then <code>startActivity</code> shows warning <code>Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with checkPermission) or explicitly handle a potential SecurityException less... (Ctrl+F1)</code> </p>
  
  <p>I don't understand that i have implement <a href="https://github.com/Karumi/Dexter" rel="noreferrer">Dexter</a> then why <code>startActivity</code> want self permission?</p>