Add Twilio to list of adopters (#6960)

Twilio uses Cortex!

Signed-off-by: avleentwilio <[email protected]>

Author: avleentwilio

ADOPTERS.md

@@ -21,3 +21,4 @@ This is the list of organisations that are using Cortex in **production environm
 * [Platform9](https://platform9.com/)
 * [REWE Digital](https://rewe-digital.com/)
 * [SysEleven](https://www.syseleven.de/)
+* [Twilio](https://www.twilio.com/)