title: changePassword() method in Firebase version 3
body: <p>I'm using firebase ver 3.2.1 in my React Native iOS project. I read the log from version 2.4.2 <a href="https://www.firebase.com/docs/web/api/firebase/changepassword.html" rel="noreferrer">here</a>, there is a method named <strong>changePassword()</strong> which can be used to change user's password.</p>
  
  <p>But when I look docs for Firebase ver 3.2.1 I can't find any method named <strong>changePassword()</strong>. So I'm wondering, is <strong>changePassword()</strong> method can not be used in Firebase version 3 anymore?</p>
  
  <p>Thanks.</p>