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Excel file without headers, skipping first line

See original GitHub issue

We are trying to use the library on an excel without headers(We set a template for download to show the way its meant to be used, but apparently thats not what they have in mind), but we saw in the code, that no matter what, the first row is always ignored because of the hardcoded + 1, there´s no way we can set skip or headerStart as negative cause an exception is thrown. Is there an option we hadn’t see to read an excel without headers?

        public static PoijiOptionsBuilder settings(int skip) {
            if (skip < 0) {
                throw new PoijiException("Skip index must be greater than or equal to 0");
            }
            return new PoijiOptionsBuilder(skip);
        }

        public PoijiOptionsBuilder headerStart(int headerStart) {
            if (headerStart < 0) {
                throw new PoijiException("Header index must be greater than or equal to 0");
            }
            this.headerStart = headerStart;
            return this;
        }

        public PoijiOptions build() {
            return new PoijiOptions()
                    .setSkip(skip + headerStart + 1)
                    .setPassword(password)
                    .setPreferNullOverDefault(preferNullOverDefault)
                    .setDatePattern(datePattern)
                    .setDateFormatter(dateFormatter)
                    .setDateTimeFormatter(dateTimeFormatter)
                    .setSheetIndex(sheetIndex)
                    .setSheetName(sheetName)
                    .setIgnoreHiddenSheets(ignoreHiddenSheets)
                    .setTrimCellValue(trimCellValue)
                    .setDateRegex(dateRegex)
                    .setDateTimeRegex(dateTimeRegex)
                    .setDateLenient(dateLenient)
                    .setHeaderStart(headerStart)
                    .setCasting(casting)
                    .setLimit(limit)
                    .setPoijiLogCellFormat(cellFormat)
                    .setPoijiNumberFormat(numberFormat)
                    .setCaseInsensitive(caseInsensitive)
                    .setNamedHeaderMandatory(namedHeaderMandatory);
        }