Compile errors in dag from g.Has, g.RemoveEdge, and g.Marshall

[GrumpyOldTroll]

~/gopath/src/github.com/jicksta/ranked-pairs-voting/cli$ go build main.go
# github.com/jicksta/ranked-pairs-voting
../dag.go:31:7: g.Has undefined (type *simple.DirectedGraph has no field or method Has)
../dag.go:36:7: g.Has undefined (type *simple.DirectedGraph has no field or method Has)
../dag.go:51:15: not enough arguments in call to g.RemoveEdge
        have (simple.Edge)
        want (int64, int64)
../dag.go:79:23: too many arguments in call to dot.Marshal
        have (*simple.DirectedGraph, string, string, string, bool)
        want (graph.Graph, string, string, string)

I've never used go before, so I worked around this by adding a .Has function inside my local gonum.org/v1/gonum/graph/simple/directed.go, by using fromID and toID instead of newEdge, and by removing the bool on the end, respectively. But ideally somebody who knows what they're doing could patch this or point me to the right way to work around this. (is there some other library path for simple that it should be using?)