Josh Newans

### Symptoms When attempting to use a `diff_drive_controller` with the latest version of `gazebo_ros2_control` (i.e. merging @bmagyar's PRs https://github.com/ros-simulation/gazebo_ros2_control/pull/89 and https://github.com/ros-simulation/gazebo_ros2_control/pull/88), the update function fails with the following error: ```...

Issue #242 revealed a bug with the diff_drive_controller's velocity/acceleration/jerk limit code. Although a PR has been made to fix this, a test should be created to prevent this in future.