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

@@ -29,15 +29,15 @@ dataset_info:
   - name: code
     dtype: string
   splits:
-  - name: test
-    num_bytes: 1609306
-    num_examples: 2000
   - name: train
     num_bytes: 96225611
     num_examples: 100000
   - name: validation
     num_bytes: 1749751
     num_examples: 2000
+  - name: test
+    num_bytes: 1609306
+    num_examples: 2000
   download_size: 100769638
   dataset_size: 99584668
 ---