readingOrder doesn't work

[atlanteh]

Describe the bug Setting readingOrder as rightToLeft have no impact on the document

To Reproduce https://gist.github.com/atlanteh/f0f0a11e359bb75582c24b32f67401bc

Expected behavior The cell should show the percentage to the right of the 'test' word

Environment (please complete the following information):

• OS: win10
• Node Version: 12
• excel4node Version: 1.7.2
• Application: Excel
• Application Version (if applicable): Office 365

Additional context I debugged the issue, and noticed that the resulting xml has readingOrder="rightToLeft"' instead of readingOrder="2"'