fix bug

Author: anla-xu

pymycobot/robot_limit.json

@@ -42,14 +42,14 @@
         "coords_max":[272, 272, 408.9, 180, 180, 180]
     },
     "MyArm":{
-        "id":[1,2,3,4,5,6,7],
+        "id":[1,2,3,4,5,6,7,8],
         "angles_min":[-160, -70, -170, -113, -170, -115, -180],
         "angles_max":[160, 115, 170, 75, 170, 115, 180],
         "coords_min":[-310, -310, -140, -180, -180, -180],
         "coords_max":[310, 310, 480, 180, 180, 180]
     },
     "MyArmSocket":{
-        "id":[1,2,3,4,5,6,7],
+        "id":[1,2,3,4,5,6,7,8],
         "angles_min":[-160, -70, -170, -113, -170, -115, -180],
         "angles_max":[160, 115, 170, 75, 170, 115, 180],
         "coords_min":[-310, -310, -140, -180, -180, -180],