title: Does rename_column take care of indexes?
body: <p>Say, we have something like this:</p>
  
  <pre><code>add_column :users, :single, :boolean
  add_index :users, :single
  </code></pre>
  
  <p>and then later we do</p>
  
  <pre><code>rename_column :users, :single, :married
  </code></pre>
  
  <p>Will ActiveRecord and/or the database handle the renaming of the index as well or do I have to manually drop the index and add it again?</p>