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

@@ -50,15 +50,15 @@ dataset_info:
   - name: sentence_B_dataset
     dtype: string
   splits:
-  - name: test
-    num_bytes: 1305846
-    num_examples: 4906
   - name: train
     num_bytes: 1180530
     num_examples: 4439
   - name: validation
     num_bytes: 132913
     num_examples: 495
+  - name: test
+    num_bytes: 1305846
+    num_examples: 4906
   download_size: 217584
   dataset_size: 2619289
 ---