Reorder split names

README.md

@@ -37,12 +37,12 @@ dataset_info:
       dtype: string
   config_name: plain_text
   splits:
-  - name: test
-    num_bytes: 1928532
-    num_examples: 1710
   - name: train
     num_bytes: 12231940
     num_examples: 10924
+  - name: test
+    num_bytes: 1928532
+    num_examples: 1710
   - name: validation
     num_bytes: 1643498
     num_examples: 1688