if can't locate ROS_fall_detector , rename it to lowercase

[Roswellii]

I'm new to ROS and hopefully this tip would help out someone like me :)

After I cloned this repo and ran catkin_make in my workspace, everything looked fine. However, I failed to use roslaunch to run this node or use roscd to locate it.

All problems were solved after I rename ROS_fall_detector to ros_fall_detector(or anything that is lowercase).

[RichardChen20]

Thank you for your contributions!