Add solution to troubleshooting (#90)

I almost posted an issue about this problem too, so I suggest noting in the documentation. I didn't expect it to be this easy, and it's probably worth pointing it out.

README.md

@@ -208,7 +208,7 @@ the output `Robot ready to receive control commands.`
 **Note:** When interacting with the teach pendant, or sending other primary programs to the robot, the
 program will be stopped. On the ROS terminal you will see an output `Connection to robot dropped,
 waiting for new connection`. In those cases, restart program execution (e.g. by pressing the play
-button on the TP).
+button on the TP, or calling `rosservice call /ur_hardware_interface/dashboard/play` as explained [here](https://github.com/UniversalRobots/Universal_Robots_ROS_Driver/issues/33) and [here](ur_robot_driver/doc/ROS_INTERFACE.md#ur_robot_driver_node)).
 
 In general, make sure you've completed the following tasks: