Mixed edges doesn't work

[awiebe]

Graphviz.it does not understand this, it only show one edge set

digraph G {

    A; B; C

    subgraph Rel1 {
        edge [dir=none, color=red]
        A -> B -> C -> A
    }

    subgraph Rel2 {
        edge [color=blue]

        B -> C
        C -> A
    }

}

[mstefaniuk]

Fixed and published.