fix jog_increment() bug

Author: anla-xu

pymycobot/generate.py

@@ -373,7 +373,7 @@ def jog_increment(self, joint_id, increment, speed):
             increment: 
             speed: int (0 - 100)
         """
-        return self._mesg(ProtocolCode.JOG_INCREMENT, joint_id, increment, speed)
+        return self._mesg(ProtocolCode.JOG_INCREMENT, joint_id, [self._angle2int(increment)], speed)
 
     def jog_stop(self):
         """Stop jog moving"""