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

@@ -16,7 +16,6 @@ source_datasets:
 task_categories:
 - text-classification
 task_ids: []
-paperswithcode_id: null
 pretty_name: OffensEval-TR 2020
 tags:
 - offensive-language-classification
@@ -30,8 +29,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: NOT
-          1: 'OFF'
+          '0': NOT
+          '1': 'OFF'
   config_name: offenseval2020-turkish
   splits:
   - name: train