Fail the command if the command don't return a given return code

[sebt3]

Is your feature request related to a problem? Please describe.
Using "cargo cmd" as a precommit hook always succed.
I would like to be able to use cargo commander as a fail-able script for git precommit hook.

Describe the solution you'd like
Add an option "continue_if_rc" that could be used as :

precommit = { cmd=[
"cargo clippy",
"cargo +nightly fmt --check"
], continue_if_rc=0}

if clippy fail then fmt is not run and cargo cmd return non-zero return-code. if fmt fail then cargo cmd return non-zero return-code.