Update preprocessor_config.json

preprocessor_config.json

@@ -3,5 +3,14 @@
   "do_resize": true,
   "size": 224,
   "resample": 3,
-  
+  "image_mean": [
+    0.485,
+    0.456,
+    0.406
+  ],
+  "image_std": [
+    0.229,
+    0.224,
+    0.225
+  ]
 }