message: new section: sponsor us
diff: # Table of Contents
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  - [Table of Contents](#table-of-contents)
  - [Introduction](#introduction)
  - [Features](#features)
  - [Issues / Suggestions](#issues--suggestions)
  - [Need Help?](#need-help)
  - [Contributors](#contributors)
  +- [Sponsor Us](#sponsor-us)
  - [License](#license)
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  # Introduction
  This library creates Open Office XML (OOXML) Presentations which are compatible with Microsoft PowerPoint, Apple Keynote, and other applications.
  @@ -273,6 +269,12 @@ PowerPoint shape definitions and some XML code via [Officegen Project](https://g
  ---
  +# Sponsor Us
  +
  +If you find this library useful, please consider sponsoring us through a [donation](https://gitbrent.github.io/PptxGenJS/sponsor)
  +
  +---
  +
  # License
  Copyright &copy; 2015-present [Brent Ely](https://github.com/gitbrent/PptxGenJS)
  