Fixed Encoding::UndefinedConversionError when saving new workbook
Fixed Encoding::UndefinedConversionError when saving new workbook

weshatheleopard/rubyXL,99cm/rubyXL,99cm/rubyXL,weshatheleopard/rubyXL,mezza/rubyXL,ThijsWouters/rubyXL,ryanmark/rubyXL,parallel588/rubyXL,ryanmark/rubyXL,ThijsWouters/rubyXL,weshatheleopard/rubyXL,mezza/rubyXL,mezza/rubyXL,ryanmark/rubyXL,parallel588/rubyXL,parallel588/rubyXL,99cm/rubyXL