Remove set-of-emails/maildir/bsd/README.md, import commit from sisimai/set-of-emails@1717fc8
Remove set-of-emails/maildir/bsd/README.md, import commit from sisimai/set-of-emails@1717fc8

sisimai/p5-Sisimai,azumakuniyuki/p5-Sisimai,azumakuniyuki/p5-Sisimai