I don't know if this is feedback on the challenge per-se, but I was a little saddened that I couldn't add dependencies to my `Cargo.toml`; I wanted to solve part of the bencode challenge using nom (perhaps overkill, but it was for fun), but I can't.

If this is a concern of load/execution times on a remote builder, it would be cool if I had some way to run the testcases locally to avoid this concern