Added arm option

Author: ArisMorgens

examples/swarm/leader-follower.py

@@ -194,7 +194,7 @@ def leader_follower(scf):
 
         swarm.reset_estimators()
 
-        # swarm.parallel_safe(arm)
+        swarm.parallel_safe(arm)
 
         print('Waiting for parameters to be downloaded...')
         swarm.parallel_safe(wait_for_param_download)