Save baseline does not work in 0.5

[aadrijnberg]

When following the documentation to save a baseline with a name, it returns an error. See https://github.com/aadrijnberg/criterion-benchmark for the repo that tries to use it, but fails with an error:

$ cargo bench -- --save-baseline initial
Finished `bench` profile [optimized] target(s) in 0.10s
 Running unittests src/lib.rs (target/release/deps/criterion_benchmark-c2076c60856bf728)
error: Unrecognized option: 'save-baseline'
error: bench failed, to rerun pass `--lib`

Did I use the wrong command line parameters to store the baseline under a certain name, or is it not working in v0.5