[AIRFLOW-XXX] Adding walmart labs as user (#6027)

[ci skip]

README.md

@@ -408,6 +408,7 @@ Currently **officially** using Airflow:
 1. [Vidio](https://www.vidio.com/)
 1. [Ville de Montréal](http://ville.montreal.qc.ca/)[@VilledeMontreal](https://github.com/VilledeMontreal/)]
 1. [Vnomics](https://github.com/vnomics) [[@lpalum](https://github.com/lpalum)]
+1. [Walmart Labs](https://www.walmartlabs.com) [[@bharathpalaksha](https://github.com/bharathpalaksha)]
 1. [Waze](https://www.waze.com) [[@waze](https://github.com/wazeHQ)]
 1. [WePay](http://www.wepay.com) [[@criccomini](https://github.com/criccomini) & [@mtagle](https://github.com/mtagle)]
 1. [WeTransfer](https://github.com/WeTransfer) [[@coredipper](https://github.com/coredipper) & [@higee](https://github.com/higee) & [@azclub](https://github.com/azclub)]