[AIRFLOW-XXX] Add Surfline to companies list (apache#4079)

Author: jawang35

README.md

@@ -262,6 +262,7 @@ Currently **officially** using Airflow:
 1. [Stripe](https://stripe.com) [[@jbalogh](https://github.com/jbalogh)]
 1. [Strongmind](https://www.strongmind.com) [[@tomchapin](https://github.com/tomchapin) & [@wongstein](https://github.com/wongstein)]
 1. [Square](https://squareup.com/)
+1. [Surfline](https://www.surfline.com/) [[@jawang35](https://github.com/jawang35)]
 1. [Tails.com](https://tails.com/) [[@alanmcruickshank](https://github.com/alanmcruickshank)]
 1. [Tesla](https://www.tesla.com/) [[@thoralf-gutierrez](https://github.com/thoralf-gutierrez)]
 1. [The Home Depot](https://www.homedepot.com/)[[@apekshithr](https://github.com/apekshithr)]