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

@@ -45,12 +45,12 @@ dataset_info:
           1: offensive
           2: none
   splits:
-  - name: test
-    num_bytes: 58913
-    num_examples: 471
   - name: train
     num_bytes: 983608
     num_examples: 7896
+  - name: test
+    num_bytes: 58913
+    num_examples: 471
   download_size: 968449
   dataset_size: 1042521
 ---