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

@@ -86,12 +86,12 @@ dataset_info:
           0: Oppose Absent
           1: Oppose Present
   splits:
-  - name: test
-    num_bytes: 205489
-    num_examples: 1995
   - name: train
     num_bytes: 821738
     num_examples: 7978
+  - name: test
+    num_bytes: 205489
+    num_examples: 1995
   download_size: 408889
   dataset_size: 1027227
 ---