update package import urls for tcp connector and urdf importer (#166)

tutorials/quick_setup.md

     ![](../images/packman.png)
 
 1. Enter the git URL for the desired package. 
-   1. For the [ROS-TCP-Connector](https://github.com/Unity-Technologies/ROS-TCP-Connector), enter `https://github.com/Unity-Technologies/ROS-TCP-Connector.git`. 
-   1. For the [URDF-Importer](https://github.com/Unity-Technologies/URDF-Importer), enter `https://github.com/Unity-Technologies/URDF-Importer.git`. 
+   1. For the [ROS-TCP-Connector](https://github.com/Unity-Technologies/ROS-TCP-Connector), enter `https://github.com/Unity-Technologies/ROS-TCP-Connector.git?path=/com.unity.robotics.ros-tcp-connector#v0.2.0`.
+   1. For the [URDF-Importer](https://github.com/Unity-Technologies/URDF-Importer), enter `https://github.com/Unity-Technologies/URDF-Importer.git?path=/com.unity.robotics.urdf-importer#v0.2.0`.
-To install from a local clone of the repository, see [installing a local package](https://docs.unity3d.com/Manual/upm-ui-local.html) in the Unity manual.
+To install from a local clone of the repository, see [installing a local package](https://docs.unity3d.com/Manual/upm-ui-local.html) in the Unity manual.