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

@@ -38,12 +38,12 @@ dataset_info:
     - name: value
       dtype: int32
   splits:
-  - name: test
-    num_bytes: 396258
-    num_examples: 1052
   - name: train
     num_bytes: 3860624
     num_examples: 10095
+  - name: test
+    num_bytes: 396258
+    num_examples: 1052
   - name: validation
     num_bytes: 418491
     num_examples: 1087