<p>I found this gem recently while investigating other things, and I think it makes sense to add it. I've updated the <code>rubocop_todo.yml</code> file with the currently failing tests, so this PR is just to add the gem. Changes to the test suite will be added in future PRs.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/2590'>https://github.com/openstreetmap/openstreetmap-website/pull/2590</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Add rubocop-minitest</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2590/files#diff-11a0d7906801d9dea0eccb85667ad811">.rubocop.yml</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2590/files#diff-74423563ec7c74f4cb7f74689b49e7c1">.rubocop_todo.yml</a>
    (34)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2590/files#diff-8b7db4d5cc4b8f6dc8feb7030baa2478">Gemfile</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2590/files#diff-e79a60dc6b85309ae70a6ea8261eaf95">Gemfile.lock</a>
    (3)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2590.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2590.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2590.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2590.diff</a></li>
</ul>

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