add realtime_urdf_filter

Author: v4hn

sources.repos

@@ -651,6 +651,10 @@ repositories:
     type: git
     url: https://github.com/ros-controls/realtime_tools.git
     version: melodic-devel
+  realtime_urdf_filter:
+    type: git
+    url: https://github.com/blodow/realtime_urdf_filter.git
+    version: master
   resource_retriever:
     type: git
     url: https://github.com/ros-o/resource_retriever.git