Bug: renderer excludes plain html from readme

Description

on the pypa warehouse readme files which include plain HTML tags are not rendered correctly. The corresponding HTML section is just omitted. This was not the case a few weeks ago.

Expected Outcome

HTML tags of a readme are also rendered.

Actual Outcome

Plain HTML tags are omitted.

Example

The swarmlib project includes a plain paragraph <p></p> in its readme:

<p align="middle">
  <img src="https://raw.githubusercontent.com/HaaLeo/swarmlib/master/doc/light_mode.png" width="49%" />
  <img src="https://raw.githubusercontent.com/HaaLeo/swarmlib/master/doc/dark_mode.png" width="49%" /> 
</p>

But for the latest release the images are not shown correctly on the pypi homepage. For swarmlib==0.12.1 the images are shown correctly. However, for swarmlib==0.13.0 no images are rendered in the readme. Since swarmlib did not change this section of its readme between the last releases I think the readme_renderer causes this issue.

[di]

I made the necessary updates in https://github.com/pypa/readme_renderer/pull/181, will release that tomorrow.

[di]

Hmm, looks like I never did make that release, and this bit us again when I forgot about this bug and updated cmarkgfm again. I’ve (again) rolled back the cmarkgfm dependency in https://github.com/pypa/warehouse/pull/9123 and will try to revisit this again soon.