wolf-graph-mermaid 0.1.0

Adds support for generating Mermaid diagrams from wolf-graph graphs.
Documentation 
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Arrowhead {
    Normal,
    None,
    Dot,
    Ex,
}

impl Arrowhead {
    pub fn tail(&self) -> &'static str {
        match self {
            Arrowhead::Normal => "<",
            Arrowhead::None => "",
            Arrowhead::Dot => "o",
            Arrowhead::Ex => "x",
        }
    }

    pub fn head(&self) -> &'static str {
        match self {
            Arrowhead::Normal => ">",
            Arrowhead::None => "",
            Arrowhead::Dot => "o",
            Arrowhead::Ex => "x",
        }
    }
}