doc: add Gusto to user
@@ -202,6 +202,7 @@ Currently **officially** using Amundsen:
1. [Devoted Health](https://www.devoted.com/)
1. [Edmunds](https://www.edmunds.com/)
1. [Everfi](https://everfi.com/)
+1. [Gusto](https://gusto.com/)
1. [ING](https://www.ing.com/Home.htm)
1. [iRobot](https://www.irobot.com)
1. [LMC](https://www.lmc.eu/cs/)
