Update config.json

config.json

@@ -3,6 +3,7 @@
     "EncoderDecoderModel"
   ],
   "decoder": {
+    "add_cross_attention": true,
     "architectures": [
       "BertForMaskedLM"
     ],
@@ -114,4 +115,4 @@
   },
   "is_encoder_decoder": true,
   "model_type": "encoder-decoder"
-}
+}