Remove redundant export

Signed-off-by: sblausten <sam@roadie.io>

plugins/events-backend/src/index.ts

@@ -21,6 +21,5 @@
  */
 
 export { EventsBackend } from './service/EventsBackend';
-export { InMemoryEventBroker } from './service/InMemoryEventBroker';
 export { HttpPostIngressEventPublisher } from './service/http';
 export { DefaultEventBroker } from './service/DefaultEventBroker';