message: fix for node issue ; updated to v3.1.0-beta
diff: {
  "name": "pptxgenjs",
  - "version": "3.0.0",
  + "version": "3.1.0-beta",
  "author": {
  "name": "Brent Ely",
  "url": "https://github.com/gitbrent/"
  },
  - "description": "Create PowerPoint Presentations with JavaScript",
  + "description": "Create JavaScript PowerPoint Presentations",
  "homepage": "https://gitbrent.github.io/PptxGenJS/",
  "license": "MIT",
  - "main": "dist/pptxgen.min.js",
  + "browser": "dist/pptxgen.min.js",
  + "main": "dist/pptxgen.cjs.js",
  "module": "dist/pptxgen.es.js",
  "files": [
  "dist"
  "javascript-generate-pptx",
  "javascript-powerpoint",
  "javascript-powerpoint-charts",
  - "javascript-powerpoint-online",
  "javascript-pptx",
  "js-create-powerpoint",
  "js-create-pptx",
  