Allow --files-from to take a dash for stdin (fixes #769)
Allow --files-from to take a dash for stdin (fixes #769)

jayme-github/restic,stuertz/restic,kurin/restic,restic/restic,restic/restic,fawick/restic,middelink/restic,fawick/restic,stuertz/restic,jayme-github/restic,kurin/restic,byo/restic,middelink/restic,byo/restic,ar-jan/restic,ar-jan/restic