HTML Comments are not hidden from Slack

[cmitz]

I expected comments, invisible in GitHub markdown, to also not be visible in Slack.

Input

<!-- Release notes generated using configuration in .github/release.yml at main -->

## Foo
bar

Output

<!-- Release notes generated using configuration in .github/release.yml at main -->

*Foo*
bar

Expected output

*Foo*
bar

[VincentLanglet]

I'm also interested by this feature (cc @floranpagliai)

Should we just replace the regex <!--.*--> by an empty string @jsarafajr ?