remove unused import

Author: davidmoten

src/main/java/rx/internal/operators/OnSubscribeRedo.java

@@ -49,7 +49,6 @@
 import rx.observers.Subscribers;
 import rx.schedulers.Schedulers;
 import rx.subjects.BehaviorSubject;
-import rx.subjects.PublishSubject;
 import rx.subscriptions.SerialSubscription;
 
 public final class OnSubscribeRedo<T> implements OnSubscribe<T> {