title: Updating Composer autoload files without `composer update`?
body: <p>I'm working on a project which has a lot of dependencies which I personally control. Whenever the namespace mapping changes in a requirement, I need to run <code>composer update</code> to refresh the Composer autoload file so the namespace mappings can be picked up.</p>
  
  <p>However if I'm making changes in the <code>vendor/</code> directory directly, there's no need to check out the latest versions through <code>composer update</code> -- all I need is to refresh the autoload file. For a project with dozens of requirements hosted on GitHub, <code>composer update</code> can take minutes.</p>
  
  <p>Is there any way to get <code>composer</code> to refresh the autoload files <em>without</em> having to run <code>composer update</code>?</p>