remove sponsor from readme

README.md

@@ -334,10 +334,6 @@ Thank you to the following people for their support and contributions!
 - @KaanMol and @mksglu for starting the Typescript port
 - @asonix for vertical slider implementation
 
-**Sponsored by [Ship Shape](https://shipshape.io)**
-
-<img width="400" src="https://raw.githubusercontent.com/jaames/iro.js/master/assets/sponsor_shipshape.png">
-
 <img height="16" height="888" src="https://raw.githubusercontent.com/jaames/iro.js/master/assets/break.png"/>
 
 [Website](//iro.js.org) |  [Forum](https://github.com/jaames/iro.js/discussions) | [Codepen Demo](//codepen.io/rakujira/pen/WZOeNq?editors=0010) | [Contribution Guide](CONTRIBUTING.md) | [Donate](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=XS9R3QTLZYAXQ&source=url) | [Changelog](CHANGELOG.md) | [License](LICENSE.txt)