Enabling HTML content

[paulovitorbal]

Check if it is HTML code as defined by graphviz,
string that starts with < and end with > with some very specific tags inside
It should return the text without any replacement

[paulovitorbal]

This should implement the PR #25

[clue]

@paulovitorbal Thank you very much for picking this up! I've just merged #26 which adds documentation for the existing behavior and also for HTML-like labels. I believe this to resolve this for now 🎉

That PR also adds documentation for the existing behavior and the reasoning behind this. All attribute values will be quoted and escaped by default so that a > will be shown as-is without being interpreted as HTML. This is by design to prevent possible injections. As an alternative, the static GraphViz::raw() method can be used as documented to prevent automatic quoting and escaping.

I'd like to get the next release out and believe this has been answered, so I'm closing this for now.

Again, thank you! 👍