[changelog] fix collapsable section for issues

[janzandr]

[janzandr]

@jakimowb not sure if you are altering the original MD file. On GitHub and inside PyCharm, the changelog is rendered correctly. In the plugin manager and in the about widget, the collapsable sections look very odd.

[janzandr]

Alright, markdown code is not supported inside the details section by default. We need to use the markdown.extensions.md_in_html extension: html_output = markdown.markdown(markdown_content, extensions=['md_in_html']) Unfortunately, this is also not working (not sure why).

As a workaround, we could insert HTML code directly into the details section.

[janzandr]

When inserting HTML directly, it is still not rendering correctly:

Should look like this:

[janzandr]

I would propose to delete the details section in case of the about dialog,