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

@@ -82,15 +82,15 @@ dataset_info:
           1: positive
           2: no_impact
   splits:
-  - name: test
-    num_bytes: 5588
-    num_examples: 104
   - name: train
     num_bytes: 48555
     num_examples: 892
   - name: validation
     num_bytes: 5788
     num_examples: 105
+  - name: test
+    num_bytes: 5588
+    num_examples: 104
   download_size: 49870
   dataset_size: 59931
 ---