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

@@ -43,15 +43,15 @@ dataset_info:
   - name: all_answers
     sequence: string
   splits:
-  - name: test
-    num_bytes: 9280845
-    num_examples: 11980
   - name: train
     num_bytes: 9588987
     num_examples: 10766
   - name: validation
     num_bytes: 2056804
     num_examples: 2280
+  - name: test
+    num_bytes: 9280845
+    num_examples: 11980
   download_size: 5796188
   dataset_size: 20926636
 ---