Reorder split names

Reorder split names in the YAML metadata to be aligned with the order in the loading script.
See: https://github.com/huggingface/datasets/issues/5258

README.md

@@ -37,15 +37,15 @@ dataset_info:
     - name: ratings
       sequence: int64
   splits:
-  - name: test
-    num_bytes: 804536
-    num_examples: 785
   - name: train
     num_bytes: 5001312
     num_examples: 4936
   - name: validation
     num_bytes: 449691
     num_examples: 447
+  - name: test
+    num_bytes: 804536
+    num_examples: 785
   download_size: 0
   dataset_size: 6255539
 ---