Add Linode as a user of OpenAPI Generator (#4720)

Author: phillc

README.md

@@ -603,6 +603,7 @@ Here are some companies/projects (alphabetical order) using OpenAPI Generator in
 - [JustStar](https://www.juststarinfo.com)
 - [Klarna](https://www.klarna.com/)
 - [Kronsoft Development](https://www.kronsoft.ro/home/)
+- [Linode](https://www.linode.com/)
 - [Médiavision](https://www.mediavision.fr/)
 - [Metaswitch](https://www.metaswitch.com/)
 - [Myworkout](https://myworkout.com)