🐛 Bug Report

If the desired name of the worksheet contains characters /, : it does not affect on actual sheet name. When I open created file via MS Excel is see default worksheet names like 'Sheet 1'. Some versions of MS Excel also show error messages and warn about file corruption.

Lib version: 4.1.1

Steps To Reproduce

1. Have exceljs@4.1.1 installed (obviously)
2. Run following code:

const {Workbook} = require('exceljs')

const workbook = new Workbook()
const sheet = workbook.addWorksheet('http://a.b/c')
sheet.addRow(['a', 'b', 'c'])
workbook.xlsx.writeFile('./result.xlsx')

3. See 'Sheet 1' instead of desired sheet name in created file

The expected behaviour:

Sheet name to be equal to first argument of addWorksheet call.

Possible solution (optional, but very helpful):

If it is xlsx constraint, throw an error, when client attempts to put unsupported characters into sheet name.