Created by: weeco
Since many listeners can be attached when calling job.finished() Bull should set the max listeners to unlimited
Otherwise you will get possible memory leak warnings like these:
(node:592) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 global:completed listeners added. Use emitter.setMaxListeners() to increase limit (node:592) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 global:failed listeners added. Use emitter.setMaxListeners() to increase limit