Follow up changes on "pubsub numsub" output

* String, String to String, Long
* We're avoiding to break backward compatibility
** convert Long to String so that return type is same to old type

src/main/java/redis/clients/jedis/Jedis.java

@@ -3388,7 +3388,7 @@ public class Jedis extends BinaryJedis implements JedisCommands,
     public Map<String, String> pubsubNumSub(String... channels) {
 	checkIsInMulti();
 	client.pubsubNumSub(channels);
-	return BuilderFactory.STRING_MAP
+	return BuilderFactory.PUBSUB_NUMSUB_MAP
 		.build(client.getBinaryMultiBulkReply());
     }