Fix `carg_args`

[LoipesMas]

cargo_args argument is supposed to be working just like cargo does with arguments after --, but I haven't managed to achieve that with clap's derives. Maybe I missed something or maybe we need to use builder api instead.

cargo-select/src/cli.rs

Line 80 in 9e30e9b

// TODO: make it a "last" argument, i.e. after "--"