Add a note about graphviz to README.md
Exclude proc-macros unless `--build-deps` is given
Creates dependency graphs for cargo projects using
cargo metadata and graphviz.
cargo install cargo-depgraph
If you are using Arch Linux, you can alternatively install the AUR package
Note: This assumes you have Graphviz installed. There are also online
tools that can generate graphics from the textual graphviz graphs
cargo depgraph generates, if
the command-line graphviz tools like
dot aren't your thing.
cargo depgraph [options] | dot -Tpng > graph.png
The full list of options can be seen by running
cargo depgraph --help
Commonly useful options: