title: Composer - how to ignore some map files?
body: <p>I'm using composer in my PHP project. There is a module which maps lots of files into to root directory. This includes files like <code>README.md</code> and <code>CHANGELOG.md</code> and the <code>generation autolod files</code> throws an error:</p>
  
  <pre><code>[ErrorException]                                                                
  Target ./README.md already exists (set extra.magento-force to override)
  </code></pre>
  
  <p>Is there a option to ignore a list of files from the mapping and don't use the override option?</p>