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

@@ -17,7 +17,6 @@ task_categories:
 - text-classification
 task_ids:
 - sentiment-classification
-paperswithcode_id: null
 pretty_name: Muchocine
 dataset_info:
   features:
@@ -29,11 +28,11 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: '1'
-          1: '2'
-          2: '3'
-          3: '4'
-          4: '5'
+          '0': '1'
+          '1': '2'
+          '2': '3'
+          '3': '4'
+          '4': '5'
   splits:
   - name: train
     num_bytes: 11871095