title: can bfg-repo-cleaner list affected files before deleting them
body: <p>From the command line option I can not see that there is a way to see what bfg will do before doing it.</p>
  
  <p>If I run this command:</p>
  
  <pre><code>$ bfg --strip-blobs-bigger-than 1M --replace-text banned.txt repo.git
  </code></pre>
  
  <p>Can I get a list of files larger than 1M before actual deleting them?</p>