Update die regex and if

[shindakun]

	matched, _ := regexp.MatchString("^[1-9]d([1-9]|[1-9][0-9]|[1-9][0-9][0-9])$", s)
	if matched == false {
		return -1, errors.New("roll again using a format like 1d20 to roll one twenty sided die")
	}

[shindakun]

test

[shindakun]

^[1-9][0-9]?$|^100$ might be better, thanks stackoverflow, should probably get around to actually updating this one day.