Update README.md

Author: zfc-zfc

README.md

@@ -145,6 +145,7 @@ sudo apt install ros-noetic-pcl*
 sudo ln -s /usr/include/pcl-1.8/pcl /usr/include/pcl
 sudo apt install ros-noetic-plotjuggler*
 sudo apt install ros-noetic-view-controller-msgs
+sudo apt install ros-noetic-octomap* 
 ```
 
 # QGC