generateMult is not available in the package 0.4.2 from NPM

[MaxTerekhov]

The feature with generation of multiple charts that is mentioned in mult.js (master branch) is absolutely brilliant:

xlsxChart.generate({
   charts: [
      opts1, opt2
   ],
   function (err, data) {}
})

Unfortunately package 0.4.2 available via NPM does not contain the implementation of generateMult in base.js. Although it contains mult.js.
Could you please release this feature.

[samortsev]

Sorry i rarely working with this project. Multiple charts was released in 0.4.2. I'm using this feature in my projects.
README.md updated with example.

xlsxChart.generate ({
    charts: [chart1, chart2, chart3]
}, function (err, data) {
    fs.writeFileSync ("chart.xlsx", data);
});