title: Update Realm database version
body: <p>I am using realm, version <strong>0.79.0</strong> in my current android project. Now I want to update realm version to <strong>0.84.0</strong> and also want to use <code>RealmConfiguration</code> at Application class to use <code>Realm.getDefaultInstance()</code> instead of <code>Realm.getInstance(context)</code> for realm initialization.</p>
  
  <p>I implemented new realm version and also change necessary configuration. But when I run my app it crashes with an error says </p>
  
  <blockquote>
    <p>Realm Migration must be provided</p>
  </blockquote>
  
  <p>thought I did not change any model class.</p>
  
  <p>Can anyone please tell me how do I change realm version with default configuration for Android without any migration? If it's not possible without migration then what would the be migration class be like?</p>