Does not work with Cargo 1.41 toml format

[icefoxen]

Don't know if you're still working on this, but I hope you are! It looks like Cargo 1.41 changed up the format of the Cargo.lock file, so now this only outputs error: No root table found for toml file. If it's an easy fix I might be able to make a PR for it.

Thanks!

[brenzi]

same here with cargo 1.41.0-nightly (8280633db 2019-11-11)