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

@@ -60,15 +60,15 @@ dataset_info:
   - name: score
     dtype: float32
   splits:
-  - name: test
-    num_bytes: 47433760
-    num_examples: 19210
   - name: train
     num_bytes: 820716084
     num_examples: 251820
   - name: validation
     num_bytes: 23468834
     num_examples: 9604
+  - name: test
+    num_bytes: 47433760
+    num_examples: 19210
   download_size: 966025624
   dataset_size: 891618678
 ---