Fix sst2 dataset name (#1)

- Fix sst2 dataset name (6a3af6d5e9378f07e02904c5d957a248dee70f8e)


Co-authored-by: Albert Villanova <albertvillanova@users.noreply.huggingface.co>

README.md

@@ -4,7 +4,7 @@ license: apache-2.0
 tags:
 - text-classification
 datasets:
-- sst-2
+- sst2
 metrics:
 - accuracy
 ---