Update config.json

config.json

@@ -21,5 +21,10 @@
   "summary_proj_to_labels": true,
   "summary_type": "cls_index",
   "summary_use_proj": true,
+  "task_specific_params": {
+    "conversational": {
+      "max_length": 1000
+    }
+  },
   "vocab_size": 50257
-}
+}