[AIRFLOW-XXX] Added Jeitto as one of happy Airflow users! (#3902)

[AIRFLOW-XXX] Add Jeitto as one happy Airflow user!

Author: brennerpablo

README.md

@@ -186,6 +186,7 @@ Currently **officially** using Airflow:
 1. [Intercom](http://www.intercom.com/) [[@fox](https://github.com/fox) & [@paulvic](https://github.com/paulvic)]
 1. [Investorise](https://investorise.com/) [[@svenvarkel](https://github.com/svenvarkel)]
 1. [Jampp](https://github.com/jampp)
+1. [Jeitto](https://www.jeitto.com.br) [[@BrennerPablo](https://github.com/BrennerPablo) & [@ds-mauri](https://github.com/ds-mauri)]
 1. [JobTeaser](https://www.jobteaser.com) [[@stefani75](https://github.com/stefani75) &  [@knil-sama](https://github.com/knil-sama)]
 1. [Kalibrr](https://www.kalibrr.com/) [[@charlesverdad](https://github.com/charlesverdad)]
 1. [Karmic](https://karmiclabs.com) [[@hyw](https://github.com/hyw)]