Add Spout in spreadsheet (#986)

* Add Spout in spreadsheet

* REMOVING ```z``` character

README.md

 ### Office
 *Libraries for working with office suite documents.*
 
+* [Spout](https://github.com/box/spout) - Read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way 
 * [PHPPowerPoint](https://github.com/PHPOffice/PHPPresentation) - A library for working with Microsoft PowerPoint Presentations.
 * [PHPWord](https://github.com/PHPOffice/PHPWord) - A library for working with Microsoft Word documents.
 * [PHPSpreadsheet](https://github.com/PHPOffice/PhpSpreadsheet) - A pure PHP library for reading and writing spreadsheet files (successor of PHPExcel)