Allow "--check" to differ with line-endings style

[Thorium]

I propose we allow fantomas --check to accept ok the files that only contain different line-ending style than original (Windows/Unix/Mac). (So \n or \r\n or whatever).

Why?

Right now what happens is:

1. fantomas detects "fantomas needs to run". Really important to run it now, otherwise build won't pass!
2. Then when I run it, it changes the endings to be happy.
3. git detects there is thousands of modified files. However, (with default git settings, line-endings not set) they are with no changes, nothing to commit.
4. I'm not going to create PRs to format 1000 of line-endings. OSS-maintainers would just decline the PR. Would cause merge-issues with any other PR open in repo.
5. ...so after build pass, I "reset file or directory changes" of all these non-modified files.
6. Any time you need to do a tiny change/PR, repeat: Goto 1.

I don't see world to be a better place with this procedure in place, it just wastes electricity and natural resources of this planet.

(A picture of modified not changed files)