[AIRFLOW-XXX] Include Pagar.me in list of users of Airflow (#4026)

README.md

@@ -229,6 +229,7 @@ Currently **officially** using Airflow:
 1. [OneFineStay](https://www.onefinestay.com) [[@slangwald](https://github.com/slangwald)]
 1. [Open Knowledge International](https://okfn.org) [@vitorbaptista](https://github.com/vitorbaptista)
 1. [Overstock](https://www.github.com/overstock) [[@mhousley](https://github.com/mhousley) & [@mct0006](https://github.com/mct0006)]
+1. [Pagar.me](https://pagar.me/) [[@pagarme](https://github.com/pagarme)
 1. [Pandora Media](https://www.pandora.com/) [[@Acehaidrey](https://github.com/Acehaidrey) & [@wolfier](https://github.com/wolfier)]
 1. [PAYMILL](https://www.paymill.com/) [[@paymill](https://github.com/paymill) & [@matthiashuschle](https://github.com/matthiashuschle)]
 1. [PayPal](https://www.paypal.com/) [[@r39132](https://github.com/r39132) & [@jhsenjaliya](https://github.com/jhsenjaliya)]