text: Title: exit code
  Body: Hello, thank you for making this library.
  How can I set the exit code to 5 instead of 1 when no tests are collected [exit-codes](https://docs.pytest.org/en/latest/reference/exit-codes.html).
  Thanks
  
  <img width="514" alt="image" src="https://user-images.githubusercontent.com/59024965/162152326-9557de85-41fc-4993-9c55-525a65cce434.png">
  