<p>This avoids a deprecation warning on rails 6.1</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/3138'>https://github.com/openstreetmap/openstreetmap-website/pull/3138</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Use .add method for adding errors</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/3138/files#diff-a7c9720207b1efb208f3edfac9d930717f73bc3451203b9a49c2b040b91c411e">app/validators/characters_validator.rb</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/3138/files#diff-8d1a67832273313990faf523203cfbd7a571727db16e6fd2431ccdb17f9b7bfb">app/validators/whitespace_validator.rb</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/3138.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/3138.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/3138.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/3138.diff</a></li>
</ul>

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