Align label mapping with sst2 config of glue dataset

Hi there, your model is using a default label mapping. Accept this PR to align the label mapping with the `sst2` config of the `glue` dataset this model was trained on. This will enable your model to be evaluated by [Hugging Face's automatic model evaluator](https://huggingface.co/spaces/autoevaluate/model-evaluator?dataset=glue)

config.json

@@ -21,5 +21,13 @@
   "tie_weights_": true,
   "torch_dtype": "float32",
   "transformers_version": "4.20.1",
-  "vocab_size": 30522
-}
+  "vocab_size": 30522,
+  "label2id": {
+    "negative": 0,
+    "positive": 1
+  },
+  "id2label": {
+    "0": "negative",
+    "1": "positive"
+  }
+}