bugfix slow down on real hardware (#18)

src/utils/planning_tools.py

@@ -84,4 +84,7 @@ def speed_multiplier(jtraj, multiplier):
     elif isinstance(jtraj, JointTrajectory):
         for p in jtraj.points:
             p.time_from_start = p.time_from_start*multiplier
+            p.velocities = []
+            p.accelerations = []
+            p.effort = []
     return jtraj