markdown.render doesn't send JSON back, but instead HTML.

[SuperSonicHub1]

$ curl \
>   -X POST \
>   -H "Accept: application/vnd.github.v3+json" \
>   https://api.github.com/markdown \
>   -d '{"text":"text"}'
<p>text</p>

Since ghapi always expects a JSON response, this causes a json.JSONDecodeError to be raised.

My current workaround is really hackish:

try:
    rendered_readme = api.markdown.render(
        b64decode(readme["content"]).decode()
    )
except JSONDecodeError as e:
    rendered_readme = e.doc

[SuperSonicHub1]

Anyone gonna handle this?