title: Where is the uid after FirebaseAuth Package upgrade?
body: <p>In previous version of firebase_auth: ^0.5.4, there was a option
  <strong><em>user.uid</em></strong> <strong>(uid is of String type)</strong>.</p>
  
  <p>In the latest version of   firebase_auth: ^0.15.0+1, which option should I select to get <strong><em>user.uid</em></strong> or its replacement.</p>
  
  <p><strong>Note about the breaking change in FirebaseAuth 0.12.0.</strong> </p>
  
  <ol>
  <li>Added new AuthResult and AdditionalUserInfo classes.</li>
  <li>Breaking Change: Sign-in methods now return AuthResult instead of FirebaseUser. Retrieve the FirebaseUser using the user property of AuthResult.
  <a href="https://i.stack.imgur.com/Oectr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Oectr.png" alt="enter image description here"></a></li>
  </ol>