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

@@ -33,12 +33,12 @@ dataset_info:
           3: '4'
           4: '5'
   splits:
-  - name: test
-    num_bytes: 9913686
-    num_examples: 6203
   - name: train
     num_bytes: 60691428
     num_examples: 40000
+  - name: test
+    num_bytes: 9913686
+    num_examples: 6203
   download_size: 16556587
   dataset_size: 70605114
 ---