message: refactor(of): remove unused import
  Remove unused import
diff: @@ -3,7 +3,6 @@ import { isScheduler } from '../util/isScheduler';
  import { fromArray } from './fromArray';
  import { Observable } from '../Observable';
  import { scheduleArray } from '../scheduled/scheduleArray';
  -import { never } from './never';
  /* tslint:disable:max-line-length */
  /** @deprecated remove in v8. Use {@link scheduled} instead `scheduled([], scheduler)` */
  