digraph dev_cycle {
    node [fontname = "arial"]
    edge [fontname = "arial" arrowhead = "none"]
    {
        node [margin=0 fontcolor=blue shape=ellipse style=filled]
        master [fillcolor=yellow label="Master"]
        unstable [fillcolor=yellow label="Unstable"]
    }
    "Bug fixes" -> "Patch";
    "New features" -> "Patch";
    "Etc." -> "Patch";
    "Patch" -> unstable [label=" PR" arrowhead = "vee"];
    unstable -> master [label=" Merge" arrowhead = "vee"];
}
