Add ContaAzul as an Airflow user

Closes #2566 from sabino/patch-1

README.md

@@ -105,6 +105,7 @@ Currently **officially** using Airflow:
 1. [Clairvoyant](https://clairvoyantsoft.com) [@shekharv](https://github.com/shekharv)
 1. [Clover Health](https://www.cloverhealth.com) [[@gwax](https://github.com/gwax) & [@vansivallab](https://github.com/vansivallab)]
 1. [Chartboost](https://www.chartboost.com) [[@cgelman](https://github.com/cgelman) & [@dclubb](https://github.com/dclubb)]
+1. [ContaAzul](https://www.contaazul.com) [[@bern4rdelli](https://github.com/bern4rdelli), [@renanleme](https://github.com/renanleme) & [@sabino](https://github.com/sabino)]
 1. [Cotap](https://github.com/cotap/) [[@maraca](https://github.com/maraca) & [@richardchew](https://github.com/richardchew)]
 1. [CreditCards.com](https://www.creditcards.com/)[[@vmAggies](https://github.com/vmAggies) &  [@jay-wallaby](https://github.com/jay-wallaby)]
 1. [Credit Karma](https://www.creditkarma.com/) [[@preete-dixit-ck](https://github.com/preete-dixit-ck) & [@harish-gaggar-ck](https://github.com/harish-gaggar-ck) & [@greg-finley-ck](https://github.com/greg-finley-ck)]