Add Datadog to the list of teams using standard

README.md

@@ -503,6 +503,7 @@ Here are a few examples of Ruby Standard-compliant teams & projects:
 * [Topkey](https://topkey.io)
 * [University of Wisconsin-Eau Claire](https://www.uwec.edu/)
 * [Cartwheel](https://www.cartwheel.org)
+* [Datadog](https://www.datadoghq.com/)
 
 Does your team use Standard? [Add your name to the list](https://github.com/standardrb/standard/edit/main/README.md)!