[BUG] Deleting a file when only_changed is enabled results in error

[J-Fields]

What exactly happened?
Steps to reproduce the behavior:

1. Configure to prettify on push with only_changed: true
2. Delete a file that would normally be prettified
3. Commit & push
4. See error: fatal: pathspec 'deletedFile.js' did not match any files

What should've happened?
Deleted files should be excluded from prettification

This should be fixable by passing --diff-filter=d to git diff