Add perennialtech and bugmaschine to the Assignees list when opening a new instance Issue (#589)

Author: bugmaschine

.github/ISSUE_TEMPLATE/new_instance.yaml

@@ -4,6 +4,8 @@ title: "[New instance] <instance name>"
 assignees: 
   - unixfox
   - samantazfox
+  - perennialtech
+  - bugmaschine
 labels:
   - instance-add