Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -17,21 +17,7 @@ task_categories:
 - token-classification
 task_ids:
 - named-entity-recognition
-paperswithcode_id: null
 pretty_name: MSRA NER
-train-eval-index:
-- config: msra_ner
-  task: token-classification
-  task_id: entity_extraction
-  splits:
-    train_split: train
-    eval_split: test
-  col_mapping:
-    tokens: tokens
-    ner_tags: tags
-  metrics:
-  - type: seqeval
-    name: seqeval
 dataset_info:
   features:
   - name: id
@@ -42,13 +28,13 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: O
-          1: B-PER
-          2: I-PER
-          3: B-ORG
-          4: I-ORG
-          5: B-LOC
-          6: I-LOC
+          '0': O
+          '1': B-PER
+          '2': I-PER
+          '3': B-ORG
+          '4': I-ORG
+          '5': B-LOC
+          '6': I-LOC
   config_name: msra_ner
   splits:
   - name: train
@@ -59,6 +45,19 @@ dataset_info:
     num_examples: 3443
   download_size: 15156606
   dataset_size: 35966008
+train-eval-index:
+- config: msra_ner
+  task: token-classification
+  task_id: entity_extraction
+  splits:
+    train_split: train
+    eval_split: test
+  col_mapping:
+    tokens: tokens
+    ner_tags: tags
+  metrics:
+  - type: seqeval
+    name: seqeval
 ---
 
 # Dataset Card for MSRA NER