[Salt] Allow code html-tag on Salt Diagram

Question

Hello PlantUML team,

• Could you allow code html-tag on salt Diagram?

Here is an example:

@startsalt
{SI
This is a long
text in a textarea
with code:
--
<code>
main()
{
  foo();
}
</code>
--
<color:red>Why?
}
@endsalt

Thanks for your works,
Regards,
Th.