Update readme: SubscriberListener -> Listener (#2078)

meltsufin · pongad · commit 6509d0f4bffa · 2017-05-23T15:58:02.000+10:00
diff --git a/google-cloud-pubsub/README.md b/google-cloud-pubsub/README.md
@@ -176,7 +176,7 @@ Subscriber subscriber = null;
 try {
   subscriber = Subscriber.defaultBuilder(subscriptionName, receiver).build();
   subscriber.addListener(
-      new Subscriber.SubscriberListener() {
+      new Subscriber.Listener() {
         @Override
         public void failed(Subscriber.State from, Throwable failure) {
           // Handle failure. This is called when the Subscriber encountered a fatal error and is shutting down.
