title: Twine is defaulting "long_description_content_type" to text/x-rst
body: <p>Heres is my setup</p>
  <pre><code>setup(
      name=&quot;`...&quot;,
      version=&quot;...&quot;,
      description=...,
      long_description_content_type=&quot;text/markdown&quot;,
      long_description=README,
      author=&quot;...&quot;,
  
      classifiers=[...],
  
      packages=[&quot;...&quot;],
      include_package_data=True,
  )
  </code></pre>
  <p>I used the following command to package my project</p>
  <pre><code>python setup.py sdist bdist_wheel 
  </code></pre>
  <p>but when I run</p>
  <pre><code>twine check dist/*
  </code></pre>
  <p>I get the following error</p>
  <pre><code>Checking dist\Futshane_TBG-1.0.0-py3-none-any.whl: FAILED
    `long_description` has syntax errors in markup and would not be rendered on PyPI.
      line 9: Error: Unexpected indentation.
    warning: `long_description_content_type` missing. defaulting to `text/x-rst`.
  Checking dist\Futshane_TBG-1.0.0.tar.gz: FAILED
    `long_description` has syntax errors in markup and would not be rendered on PyPI.
      line 9: Error: Unexpected indentation.
    warning: `long_description_content_type` missing. defaulting to `text/x-rst`.
  </code></pre>
  <p>Why is it failing to identify the type provided, when I've obviously provided one?</p>