Merge pull request #333 from mallezie/update-sponsor

Update README.md

Author: mglaman

README.md

@@ -6,7 +6,7 @@ Extension for [PHPStan](https://phpstan.org/) to allow analysis of Drupal code.
 
 ## Sponsors
 
-<a href="https://www.undpaul.de/"><img src="https://www.undpaul.de/themes/custom/undpaul3/logo.svg" alt="undpaul" width="250" /></a> <a href="https://www.intracto.com/"><img src="https://digidak.be/wp-content/uploads/2020/03/logo-intracto-base-positief-grijs-blauw@4x-rgb.png" alt="Intracto" width="225" /></a>
+<a href="https://www.undpaul.de/"><img src="https://www.undpaul.de/themes/custom/undpaul3/logo.svg" alt="undpaul" width="250" /></a> <a href="https://www.iodigital.com/en"><img src="https://www.drupal.org/files/iO-logo%2Bblack.png" alt="iO" width="225" /></a>
 
 [Would you like to sponsor?](https://github.com/sponsors/mglaman)