[AIRFLOW-531] Add T2 Systems as Airflow User

Closes apache#1812 from r39132/master

README.md

@@ -123,6 +123,7 @@ Currently **officially** using Airflow:
 1. [SmartNews](https://www.smartnews.com/) [[@takus](https://github.com/takus)]
 1. Stripe [[@jbalogh](https://github.com/jbalogh)]
 1. [Thumbtack](https://www.thumbtack.com/) [[@natekupp](https://github.com/natekupp)]
+1. [T2 Systems](http://t2systems.com) [[@unclaimedpants](https://github.com/unclaimedpants)]
 1. [Vente-Exclusive.com](http://www.vente-exclusive.com/) [[@alexvanboxel](https://github.com/alexvanboxel)]
 1. [WePay](http://www.wepay.com) [[@criccomini](https://github.com/criccomini) & [@mtagle](https://github.com/mtagle)]
 1. [WeTransfer](https://github.com/WeTransfer) [[@jochem](https://github.com/jochem)]