Fix exemple

[ImenEdhri]

Fix exemple code

[Ariela1127]

Does this example work for you? I keep getting the following error:

xlsx.js:4334 Uncaught TypeError: s.t.match is not a function
    at write_sst_xml (xlsx.js:4334)
    at write_sst (xlsx.js:8914)
    at write_zip (xlsx.js:11783)
    at write_zip_type (xlsx.js:11859)
    at Object.writeSync [as write] (xlsx.js:11873)
    at ExcelFile.download (ExcelFile.js:104)
    at HTMLUnknownElement.callCallback (vendor.js?v=a-ZljQae6dpuU74rEYxmbJ-QqW4BJAlPY0nvq7r3qA8:17669)
    at Object.invokeGuardedCallbackDev (vendor.js?v=a-ZljQae6dpuU74rEYxmbJ-QqW4BJAlPY0nvq7r3qA8:17708)
    at Object.invokeGuardedCallback (vendor.js?v=a-ZljQae6dpuU74rEYxmbJ-QqW4BJAlPY0nvq7r3qA8:17565)
    at Object.invokeGuardedCallbackAndCatchFirstError (vendor.js?v=a-ZljQae6dpuU74rEYxmbJ-QqW4BJAlPY0nvq7r3qA8:17579)

[vishal1785]

This does not work. It gives me the same error.