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

@@ -33,15 +33,15 @@ dataset_info:
           3: Politics
           4: World
   splits:
-  - name: test
-    num_bytes: 41195
-    num_examples: 582
   - name: train
     num_bytes: 144932
     num_examples: 2045
   - name: validation
     num_bytes: 20565
     num_examples: 290
+  - name: test
+    num_bytes: 41195
+    num_examples: 582
   download_size: 195824
   dataset_size: 206692
 ---