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

@@ -32,12 +32,12 @@ dataset_info:
           0: '0'
           1: '1'
   splits:
-  - name: test
-    num_bytes: 1292103
-    num_examples: 1078
   - name: train
     num_bytes: 5026582
     num_examples: 4302
+  - name: test
+    num_bytes: 1292103
+    num_examples: 1078
   download_size: 2357808
   dataset_size: 6318685
 ---