Feature request: hide transitive dependencies

[Chadehoc]

When the dependency graph becomes unreadable, it would be nice to simplify it by hiding A -> C if already implied by A -> B and B -> C; i.e. hiding dependencies that are transitively implied by already shown dependencies.

See cargo-depgraph's --dedup-transitive-deps option (https://github.com/jplatte/cargo-depgraph).