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

@@ -9,7 +9,6 @@ license:
 - mit
 multilinguality:
 - monolingual
-pretty_name: Beans
 size_categories:
 - 1K<n<10K
 source_datasets:
@@ -18,6 +17,7 @@ task_categories:
 - image-classification
 task_ids:
 - multi-class-image-classification
+pretty_name: Beans
 dataset_info:
   features:
   - name: image_file_path
@@ -28,9 +28,9 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: angular_leaf_spot
-          1: bean_rust
-          2: healthy
+          '0': angular_leaf_spot
+          '1': bean_rust
+          '2': healthy
   splits:
   - name: train
     num_bytes: 382110