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:
   - name: label
     dtype: bool
   splits:
-  - name: test
-    num_bytes: 1220662901
-    num_examples: 415416
   - name: train
     num_bytes: 2888035757
     num_examples: 901028
   - name: validation
     num_bytes: 1371399694
     num_examples: 415416
+  - name: test
+    num_bytes: 1220662901
+    num_examples: 415416
   download_size: 47955874
   dataset_size: 5480098352
 ---