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

@@ -27,12 +27,12 @@ dataset_info:
   - name: rating
     dtype: float32
   splits:
-  - name: test
-    num_bytes: 514527
-    num_examples: 1006
   - name: train
     num_bytes: 4899539
     num_examples: 9577
+  - name: test
+    num_bytes: 514527
+    num_examples: 1006
   - name: validation
     num_bytes: 515785
     num_examples: 1002