Incorrect exit status for fails

Hi,

I run danger-swift on Bitrise as a script step in which I execute:
`swift run danger-swift ci`

and regardless of the output it always return 0 as status code.

Danger correctly finds violated rules, shows a message "Failing the build, there are x fails." and posts messages under the PR/MR but the exit status is always 0 so the CI build continues instead of failing. I've also tried to run it with the "--fail-on-errors" flag but it didn't helped.