message: updated badges and title desc
diff: -[![MIT Licence](https://img.shields.io/github/license/gitbrent/pptxgenjs.svg)](https://opensource.org/licenses/mit-license.php) [![npm version](https://img.shields.io/npm/v/pptxgenjs.svg)](https://www.npmjs.com/package/pptxgenjs) [![npm downloads](https://img.shields.io/npm/dm/pptxgenjs.svg)](https://www.npmjs.com/package/pptxgenjs) [![jsdelivr downloads](https://data.jsdelivr.com/v1/package/gh/gitbrent/pptxgenjs/badge)](https://www.jsdelivr.com/package/gh/gitbrent/pptxgenjs) [![Package Quality](http://npm.packagequality.com/shield/pptxgenjs.png?style=flat-square)](https://github.com/gitbrent/pptxgenjs)
  +[![MIT Licence](https://img.shields.io/github/license/gitbrent/pptxgenjs.svg)](https://opensource.org/licenses/mit-license.php) [![Known Vulnerabilities](https://snyk.io/test/npm/pptxgenjs/badge.svg)](https://snyk.io/test/npm/pptxgenjs) [![Package Quality](http://npm.packagequality.com/shield/pptxgenjs.png?style=flat-square)](https://github.com/gitbrent/pptxgenjs) [![npm downloads](https://img.shields.io/npm/dm/pptxgenjs.svg)](https://www.npmjs.com/package/pptxgenjs) [![jsdelivr downloads](https://data.jsdelivr.com/v1/package/gh/gitbrent/pptxgenjs/badge)](https://www.jsdelivr.com/package/gh/gitbrent/pptxgenjs)
  # PptxGenJS
  -### JavaScript library that produces PowerPoint (pptx) presentations
  +## JavaScript library that creates PowerPoint presentations
  Quickly and easily create PowerPoint presentations with a few simple JavaScript commands in client web browsers or Node desktop apps.
  -## Main Features
  +### Main Features
  * Widely Supported: Creates and downloads presentations on all current web browsers (Chrome, Edge, Firefox, etc.) and IE11
  * Full Featured: Slides can include Charts, Images, Media, Shapes, Tables and Text (plus Master Slides/Templates)
  * Easy To Use: Entire PowerPoint presentations can be created in a few lines of code
  * Modern: Pure JavaScript solution - everything necessary to create PowerPoint PPT exports is included
  -## Additional Features
  +### Additional Features
  * Use the unique [HTML-to-PowerPoint](#html-to-powerpoint-feature) feature to copy an HTML table into 1 or more Slides with a single command
  **************************************************************************************************
  