[AIRFLOW-XXX] Add Compass to companies list (#3972)

We're using Airflow at Compass now.

README.md

@@ -135,6 +135,7 @@ Currently **officially** using Airflow:
 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. [Collectivehealth Inc.](https://www.collectivehealth.com) [@retornam](https://github.com/retornam)
+1. [Compass](https://www.compass.com) [[@wdhorton](https://github.com/wdhorton)]
 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. [Craig@Work](https://www.craigatwork.com)