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

@@ -34,12 +34,12 @@ dataset_info:
           4: placeName
           5: time
   splits:
-  - name: test
-    num_bytes: 221092
-    num_examples: 2058
   - name: train
     num_bytes: 1612125
     num_examples: 15794
+  - name: test
+    num_bytes: 221092
+    num_examples: 2058
   - name: validation
     num_bytes: 196652
     num_examples: 1941