cargo upgrade: Don't change crate source

[not-matthias]

I have a custom log crate on my Github which is called log. However, there's also a public crate called log. So when I try to upgrade my dependencies with cargo upgrade, my own crate will be replaced with the one from crates.io.

How to reproduce

Create a log crate, upload it to a Github repository and add it to a project.

log = { git = "https://github.com/<username>/<repository>" }

If you now run cargo upgrade, the Cargo.toml will look like this:

log = "0.4.8"

[ordian]

@not-matthias which version of cargo-edit do you use? This is resolved in the latest version.

[not-matthias]

@ordian I'm using the latest version.

C:\>cargo upgrade --version
cargo-upgrade 0.6.0

[epage]

If nothing else, this should be resolved by #725