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

@@ -38,15 +38,15 @@ dataset_info:
     - name: text
       dtype: string
   splits:
-  - name: test
-    num_bytes: 2657644
-    num_examples: 5097
   - name: train
     num_bytes: 12966443
     num_examples: 30526
   - name: validation
     num_bytes: 1458106
     num_examples: 2768
+  - name: test
+    num_bytes: 2657644
+    num_examples: 5097
   download_size: 29939366
   dataset_size: 17082193
 ---