Update README.md

Author: yeah42

README.md

@@ -932,6 +932,7 @@ Here are some companies/projects using Swagger Codegen in production. To add you
 - [Mporium](http://mporium.com/)
 - [Neverfail](https://neverfail.com/)
 - [NexCap](http://www.nexess-solutions.com/fr/plateforme-iot/)
+- [Nitrobox](https://www.nitrobox.com)
 - [Norwegian Air Shuttle](https://www.norwegian.com/)
 - [NTT DATA](http://www.nttdata.com/)
 - [nViso](http://www.nviso.ch/)