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

@@ -1,5 +1,4 @@
 ---
-pretty_name: RottenTomatoes - MR Movie Review Data
 annotations_creators:
 - crowdsourced
 language_creators:
@@ -10,15 +9,38 @@ license:
 - unknown
 multilinguality:
 - monolingual
+size_categories:
+- 1K<n<10K
+source_datasets:
+- original
 task_categories:
 - text-classification
 task_ids:
 - sentiment-classification
 paperswithcode_id: mr
-size_categories:
-- 1K<n<10K
-source_datasets:
-- original
+pretty_name: RottenTomatoes - MR Movie Review Data
+dataset_info:
+  features:
+  - name: text
+    dtype: string
+  - name: label
+    dtype:
+      class_label:
+        names:
+          '0': neg
+          '1': pos
+  splits:
+  - name: train
+    num_bytes: 1074810
+    num_examples: 8530
+  - name: validation
+    num_bytes: 134679
+    num_examples: 1066
+  - name: test
+    num_bytes: 135972
+    num_examples: 1066
+  download_size: 487770
+  dataset_size: 1345461
 train-eval-index:
 - config: default
   task: text-classification
@@ -68,28 +90,6 @@ train-eval-index:
     name: Recall weighted
     args:
       average: weighted
-dataset_info:
-  features:
-  - name: text
-    dtype: string
-  - name: label
-    dtype:
-      class_label:
-        names:
-          0: neg
-          1: pos
-  splits:
-  - name: train
-    num_bytes: 1074810
-    num_examples: 8530
-  - name: validation
-    num_bytes: 134679
-    num_examples: 1066
-  - name: test
-    num_bytes: 135972
-    num_examples: 1066
-  download_size: 487770
-  dataset_size: 1345461
 ---
 
 # Dataset Card for "rotten_tomatoes"