message: updated test to verify charts and shapes are exported correctly
diff: import React from "react";
  import logo from "./logo.svg";
  import "./App.css";
  -//import pptxgen from "./pptxgen.es.js"; // LOCAL DEV TESTING src=`PptxGenJS/dist`
  -import pptxgen from "pptxgenjs"; // react-app webpack will use package.json `"module": "dist/pptxgen.es.js"` value
  +import pptxgen from "./pptxgen.es.js"; // LOCAL DEV TESTING src=`PptxGenJS/dist`
  +//import pptxgen from "pptxgenjs"; // react-app webpack will use package.json `"module": "dist/pptxgen.es.js"` value
  function App() {
  const demoCode = `import pptxgen from "pptxgenjs";
  @@ -33,7 +33,26 @@ pptx.writeFile("react-demo.pptx");`;
  function runDemo() {
  let pptx = new pptxgen();
  - let slide = pptx.addSlide();
  + pptx.defineSlideMaster({
  + title: "MASTER_SLIDE",
  + bkgd: "FFFFFF",
  + margin: [0.5, 0.25, 1.0, 0.25],
  + slideNumber: { x: 0.6, y: 7.1, color: "FFFFFF", fontFace: "Arial", fontSize: 10 },
  + objects: [{ rect: { x: 0.0, y: 6.9, w: "100%", h: 0.6, fill: "003b75" } }, { image: { x: 11.45, y: 5.95, w: 1.67, h: 0.75, data: "logo" } }]
  + });
  + let slide = pptx.addSlide('MASTER_SLIDE');
  +
  + let dataChartRadar = [
  + {
  + name : 'Region 1',
  + labels: ['May', 'June', 'July', 'August', 'September'],
  + values: [26, 53, 100, 75, 41]
  + }
  + ];
  + slide.addChart( pptx.charts.RADAR, dataChartRadar, { x:0.36, y:2.25, w:4.0, h:3, radarStyle:'standard' } );
  +
  + slide.addShape( pptx.shapes.RECTANGLE, {x:4.36, y:2.36, w:5, h:2.5, fill:'FF6699'});
  +
  slide.addText("React Demo!", { x: 1, y: 1, w: "80%", h: 1, fontSize: 36, fill: "eeeeee", align: "center" });
  pptx.writeFile("pptxgenjs-demo-react.pptx");
  