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

@@ -38,12 +38,12 @@ dataset_info:
   - name: answerKey
     dtype: string
   splits:
-  - name: test
-    num_bytes: 377740
-    num_examples: 1172
   - name: train
     num_bytes: 351888
     num_examples: 1119
+  - name: test
+    num_bytes: 377740
+    num_examples: 1172
   - name: validation
     num_bytes: 97254
     num_examples: 299
@@ -64,12 +64,12 @@ dataset_info:
   - name: answerKey
     dtype: string
   splits:
-  - name: test
-    num_bytes: 661997
-    num_examples: 2376
   - name: train
     num_bytes: 623254
     num_examples: 2251
+  - name: test
+    num_bytes: 661997
+    num_examples: 2376
   - name: validation
     num_bytes: 158498
     num_examples: 570