URDF revert to fix linux build

CHANGELOG.md

@@ -2,6 +2,25 @@
 
 Below is summarized list of important changes. This does not include minor/less important changes or bug fixes or documentation update. This list updated every few months. For complete detailed changes, please review [commit history](https://github.com/Microsoft/AirSim/commits/master).
 
+### CoSys-Lab Modifications
+* Updated [ROS implementation](docs/ros.md)
+* Added [HySLAM Benchmark Scenario environment](docs/hyslambenchmarkenv.md)
+* Added [HySLAM environment](docs/hyslamenv.md)
+* Added [CoSysLab environment](docs/cosysenv.md)
+* Added [Echo sensor type](docs/echo.md)
+* Added [URDF vehicle type](docs/UrdfXml.md) made by [Mitchell Spryn](http://www.mitchellspryn.com). **Currently removed due to crashes on Linux!**
+* Added [WIP Instance Segmentation](docs/instance_segmentation.md). **Currently only works in Unreal Editor, not cooked builds!** Replaces previous system with 255 color limit. 
+* Added WIP [GPU LIDAR sensor type](docs/gpulidar.md): Uses GPU acceleration to simulate a Lidar sensor. Can support much higher point density then normal Lidar.
+* Updated [ComputerVision mode](docs/image_apis.md#computer-vision-mode-1): Now has full API and Simulation just like other vehicle types. It mostly means it can now have sensors attached. Improved handling and camera operation.
+* Updated [LIDAR sensor type](docs/lidar.md): Fixed not tracing correctly, added ground truth (point labels) generation, added range-noise generation.
+* Added option to hot-reload plugin through Unreal Editor (faster development)
+* Added WIP usage of engine-time for frequency updaters and timestamps instead of real-time. Useful for heavy performance sensor modalities. Currently only usable on the Echo and LIDAR sensor types.
+* Added [skid steering SimMode and vehicle type](docs/skid_steer_vehicle.md) based on NVidia tank PhysX vehicle model. ClearPath Husky and Pioneer P3DX implemented as vehicle types using this new vehicle model. 
+* Added BoxCar vehicle model to the Car SimMode to have a smaller vehicle to use in indoor spaces.
+* Updated standard camera render resolution target to 960x540. Updated standard uncompressed image format to RGB instead of BGR (this breaks OpenCV support but fixes ROS images). 
+* Added option to Cameras, EchoSensor and GPULidar to ignore certain objects with the _MarkedIgnore_ Unreal tag and enabling the "IgnoreMarked" setting in [the settings file](docs/settings.md).
+* Updated Unreal to 4.22
+
 ### November, 2018
 * Added Weather Effects and [APIs](docs/apis.md#weather-apis)
 * Added [Time of Day API](docs/apis.md#time-of-day-api)