title: Twitter4j: User's profile URL is always null
body: <p>I am trying to retrieve User's profile having a valid token. I am able to get the profile with all the info, but with no profile URL
  Tried both</p>
  <pre><code> User user = twitter.users().showUser(twitter.getId());
  </code></pre>
  <p>and</p>
  <pre><code> User user = twitter.verifyCredentials();
  </code></pre>
  <p>Both requests work fine but return null when I call</p>
  <pre><code>user.getURL()
  </code></pre>
  <p>What can be a problem? Profile URL seems to be public information, I don't think am supposed to set any specific parameters or obtain permissions, provided I already have the token.
  My Twitter4J version is 4.0.6</p>