title: How to make VSCode honor black excluded files in pyproject.toml configuration when using formatOnSave
body: <p>I have the following <code>pyproject.toml</code> for configuring black:</p>
  <pre><code>[tool.black]
  exclude = 'foo.py'
  </code></pre>
  <p>If I run <code>black .</code> from the project's root folder that only contains <code>foo.py</code>, I get <code>No Python files are present to be formatted. Nothing to do �</code> as expected.</p>
  <p>However, when I save <code>foo.py</code> from within VS Code (I have black configured as the formatter and enabled Format On Save), the file is still formatted by black.</p>
  <p>Interestingly, VS Code seems to honor other configurations, e.g. <code>line-length</code>.</p>
  <p>Is there a way to make VSCode honor the <code>exclude</code> configuration?</p>