update readme

README.md

@@ -36,7 +36,7 @@ Clone the repository and catkin_make:
 Download [NSH indoor outdoor](https://drive.google.com/file/d/1s05tBQOLNEDDurlg48KiUWxCp-YqYyGH/view) to YOUR_DATASET_FOLDER. 
 
 ```
-    roslaunch aloam_velodyne aloam_velodyne_16.launch
+    roslaunch aloam_velodyne aloam_velodyne_VLP_16.launch
     rosbag play YOUR_DATASET_FOLDER/nsh_indoor_outdoor.bag
 ```
 
@@ -45,7 +45,7 @@ Download [NSH indoor outdoor](https://drive.google.com/file/d/1s05tBQOLNEDDurlg4
 Download [KITTI Odometry dataset](http://www.cvlibs.net/datasets/kitti/eval_odometry.php) to YOUR_DATASET_FOLDER and set the `dataset_folder` and `sequence_number` parameters in `kitti_helper.launch` file. Note you also convert KITTI dataset to bag file for easy use by setting proper parameters in `kitti_helper.launch`. 
 
 ```
-    roslaunch aloam_velodyne aloam_velodyne_64.launch
+    roslaunch aloam_velodyne aloam_velodyne_HDL_64.launch
     roslaunch aloam_velodyne kitti_helper.launch
 ```
 <img src="https://github.com/HKUST-Aerial-Robotics/A-LOAM/blob/devel/picture/kitti_gif.gif" width = 720 height = 351 />