Update ADOPTERS.md (#2069)

Add BT to the adopters list

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Author: oldhamtj

ADOPTERS.md

@@ -15,4 +15,4 @@ If you are open to others contacting you about your use of ACK on the Kubernets
 | Organization | Description | Contacts | Link |
 | --- | --- | --- | --- |
 | Adobe | Global Kubernetes cluster provisioning, stateful service infrastructure provisioning using multiple ACK controllers | `@eadasiak` |  |
-
+| BT | Modern platform for applications, using declarative approach to AWS service instantiation to create rich system architectures | `@oldhamtj` | |