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

@@ -40,15 +40,15 @@ dataset_info:
           4: time_conv
           5: curr_conv
   splits:
-  - name: test
-    num_bytes: 445810
-    num_examples: 2500
   - name: train
     num_bytes: 974320061
     num_examples: 3112679
   - name: validation
     num_bytes: 444553
     num_examples: 2500
+  - name: test
+    num_bytes: 445810
+    num_examples: 2500
   download_size: 2111358901
   dataset_size: 975210424
 ---