Delete filtering contigs on `_` in `--karyotype`

[Adoni5]

Hey,

I've deleted the line! This means any contig name will be accepted.

I've also move the target override

[target.x86_64-apple-darwin]
rustflags = ["-C", "link-arg=-mmacosx-version-min=10.12"]

From Cargo.toml to config.toml. See https://doc.rust-lang.org/cargo/reference/config.html.

This won't make any noticable difference during compilation, but will get rid of the

warning: unused manifest key: target.x86_64-apple-darwin.rustflags

warning during compilation!

Thanks man, Rory

[wdecoster]

Great, thank you! I will make a new release soon.