Add UrbanSim to organizations list

Author: martjanz

README.md

@@ -3797,6 +3797,7 @@ Other Style Guides
   - **TheLadders**: [TheLadders/javascript](https://github.com/TheLadders/javascript)
   - **The Nerdery**: [thenerdery/javascript-standards](https://github.com/thenerdery/javascript-standards)
   - **T4R Technology**: [T4R-Technology/javascript](https://github.com/T4R-Technology/javascript)
+  - **UrbanSim**: [urbansim](https://github.com/urbansim/)
   - **VoxFeed**: [VoxFeed/javascript-style-guide](https://github.com/VoxFeed/javascript-style-guide)
   - **WeBox Studio**: [weboxstudio/javascript](https://github.com/weboxstudio/javascript)
   - **Weggo**: [Weggo/javascript](https://github.com/Weggo/javascript)