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: label
     dtype: int32
   splits:
-  - name: test
-    num_bytes: 5121479
-    num_examples: 6963
   - name: train
     num_bytes: 17159918
     num_examples: 25262
+  - name: test
+    num_bytes: 5121479
+    num_examples: 6963
   - name: validation
     num_bytes: 2186987
     num_examples: 2985