Up RobotDynamics dep

Author: Brian Jackson

Project.toml

@@ -17,7 +17,7 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 DocStringExtensions = "0.8"
 FiniteDiff = "2"
 ForwardDiff = "0.10"
-RobotDynamics = "0.4.3"
+RobotDynamics = "0.4.8"
 RobotZoo = "0.3"
 Rotations = "1"
 StaticArrays = "1"