lowering nav velocity rate to 15

stretch_core/launch/stretch_driver.launch

@@ -34,7 +34,7 @@
   </node>
 
   <node name="stretch_driver" pkg="stretch_core" type="stretch_driver" output="screen">
-    <param name="rate" type="double" value="25.0"/>
+    <param name="rate" type="double" value="15.0"/>
     <param name="timeout" type="double" value="0.5"/>
     <remap from="cmd_vel" to="/stretch/cmd_vel" />
     <remap from="joint_states" to="/stretch/joint_states" />