Add Auth0 to companies using Airflow

We are using airflow and loving it :)

README.md

@@ -85,6 +85,7 @@ Currently **officially** using Airflow:
 1. [allegro.pl](http://allegro.tech/) [[@kretes](https://github.com/kretes)]
 1. [AltX](https://www.getaltx.com/about) [[@pedromduarte](https://github.com/pedromduarte)]
 1. [Apigee](https://apigee.com) [[@btallman](https://github.com/btallman)]
+1. [Auth0](https://auth0.com) [[@sicarul](https://github.com/sicarul)]
 1. [Bellhops](https://github.com/bellhops)
 1. [Bloc](https://www.bloc.io) [[@dpaola2](https://github.com/dpaola2)]
 1. BlueApron [[@jasonjho](https://github.com/jasonjho) & [@matthewdavidhauser](https://github.com/matthewdavidhauser)]