typo

gleu.py

@@ -240,4 +240,4 @@ class gleu(evaluate.Metric):
         
         final_gleu_score = get_gleu_stats([gleu_calculator.compute_gleu(stats)
           for stats in iter_stats ])[0]
-        return return {"gleu_score": final_gleu_score}
+        return {"gleu_score": final_gleu_score}