V3.0.3-stable

• fix bug
• update framework to 3.0

V2.2.1 - stable version

• update ldlidar driver software framework
• fix a little bug

V2.1.7 - stable version

changlog:

• Fix the laser scan time setting of laser topic messages;
• Add the function of launching the launch file to start the lidar node and display the data on Rviz;
• Update README

V2.1.6 - stable version

Add new features:

1. Add the angle cropping function, you can configure the angle range that does not display the point cloud in the launch file;
2. Add the function of setting the laser scanning direction, which can be configured in the launch file;
3. Modify the values of "topic_name" and "frame_id"