title: git append "Reviewed-by" to commits
body: <p>Apparently not the most popular situation, but I have a number of commits to whose messages I want to append a line <code>Reviewed-by: user&lt;mail&gt;</code>.</p>
  
  <p>So far I only found this command which fails for me with <code>Invalid line: 10: Reviewed-by: User &lt;mail&gt;</code></p>
  
  <pre><code>GIT_EDITOR='git interpret-trailers --trailer "Reviewed-by: User &lt;mail&gt;" --in-place' git rebase -i HEAD~8
  </code></pre>
  
  <p>I also asked on IRC, to no avail.</p>
  
  <p>Any other suggestions are welcome.</p>