message: don't render raw html or data/javascript URLs in crate readmes
diff: @@ -359,6 +359,7 @@ fn render_markdown(text: &str) -> String {
  let options = {
  let mut options = ComrakOptions::default();
  + options.safe = true;
  options.ext_superscript = true;
  options.ext_table = true;
  options.ext_autolink = true;
  