update changes between ROS 1 and ROS 2 article (#104)
update changes between ROS 1 and ROS 2 article (#104)

* update changes between ROS 1 and ROS 2 article
ros2/design,Po-Jen/design,gbiggs/design,gbiggs/design,Po-Jen/design,gbiggs/design,ros2/design,gbiggs/design,ros2/design,gbiggs/design,ros2/design,Po-Jen/design,Po-Jen/design,Po-Jen/design,ros2/design