Repo not deploying to PyPI successfully

[makermelissa]

It is failing at

HTTPError: 400 Client Error: The description failed to render for 'text/x-rst'. See https://pypi.org/help/#description-content-type for more information. for url: https://upload.pypi.org/legacy/

I did a little googling and they made a change in May 2019 that is causing this. Looking at the commit history, the last successful deployment was March 14, 2019. So there probably needs to be some setup tweak.

[makermelissa]

I think the issue is that the README.rst has an invalid RST format.

[makermelissa]

I found the issue by running the following:

pip3 install --upgrade sdist twine
rm -R dist
python3 setup.py sdist
twine check dist/*

and got the following error:

Checking dist/adafruit-circuitpython-ht16k33-2.1.4.dev15+g058e121.tar.gz: FAILED
  `long_description` has syntax errors in markup and would not be rendered on PyPI.
    line 2: Warning: Title underline too short.

    Introduction
    ============