Import diff from https://github.com/sisimai/p5-Sisimai/pull/229/files#diff-3327a398c6d40e7711b2bb7dd459b181 #78
Import diff from https://github.com/sisimai/p5-Sisimai/pull/229/files#diff-3327a398c6d40e7711b2bb7dd459b181 #78

azumakuniyuki/rb-Sisimai,azumakuniyuki/rb-Sisimai