xlsx-to-csv postprocess で*.xlsもcsvに変換できるようにする。 #90
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https://deno.land/x/[email protected]#xlsx によると xlsx -> csv 変換に使っている readXLSX および xlsx は SheetJS をベースとしており、https://docs.sheetjs.com/docs/miscellany/formats によると SheetJS は xls ファイルにも対応しているので、xlsx-to-csv のロジックそのままで *.xls も csv に変換できると知りました。
調布市観光施設一覧 のように、*.xls ファイルでオープンデータを公開している自治体も多いので、xlsx-to-csv で *.xls にも対応することを提案します。
関連 Issue: #83