add BelugaDB to Airflow users

Closes apache#3339 from lucianoviola/add-belugadb-to-
company-list

README.md

@@ -98,6 +98,7 @@ Currently **officially** using Airflow:
 1. [Azri Solutions](http://www.azrisolutions.com/) [[@userimack](https://github.com/userimack)]
 1. [BandwidthX](http://www.bandwidthx.com) [[@dineshdsharma](https://github.com/dineshdsharma)]
 1. [Bellhops](https://github.com/bellhops)
+1. [BelugaDB](https://belugadb.com) [[@fabio-nukui](https://github.com/fabio-nukui) & [@joao-sallaberry](http://github.com/joao-sallaberry) & [@lucianoviola](https://github.com/lucianoviola) & [@tmatuki](https://github.com/tmatuki)]
 1. [BlaBlaCar](https://www.blablacar.com) [[@puckel](https://github.com/puckel) & [@wmorin](https://github.com/wmorin)]
 1. [Bloc](https://www.bloc.io) [[@dpaola2](https://github.com/dpaola2)]
 1. [BlueApron](https://www.blueapron.com) [[@jasonjho](https://github.com/jasonjho) & [@matthewdavidhauser](https://github.com/matthewdavidhauser)]